Vũ Đức Thiện (born April 8, 1991), better known by his stage names Rhymastic or YC, is a Vietnamese rapper, singer, songwriter, and record producer. He is currently a member of SpaceSpeakers.
Life and career Early life
Rhymastic was born Vũ Đức Thiện and grew up in a family where his parents were ordinary civil servants but highly educated. His paternal grandfather was a literature teacher who passed down knowledge of Hán characters and poetry to him. He has stated that he was heavily influenced by his family and their intellectual lineage. During elementary school, a neighbor visited and, noticing his beautiful hands, advised the family to enroll him in music lessons. His family subsequently took him to learn the organ, giving him early exposure to sound. In middle school, his older brother took him to a hip-hop club in Hanoi. After witnessing the performances, Thiện was deeply impressed by the genre. Back home, he studied it further, learning from rappers on channels like MTV and searching the internet to understand rap lyrics, how artists worked, and what they composed. Thiện considers 2Pac and Eminem his inspirations at the time. He once composed a rap segment for the skit "Alo 123" by People's Artist Công Lý and was paid 200,000 VND: "That was the first money I ever earned from music; I was very happy and proud."
In 2006, Thiện took the stage name Young Crizzal (YC), began performing hip-hop, and joined the GVR rap community. During this period, he spent most of his time researching rap and teaching himself new skills alongside other GVR members. In 2008, he entered the "Đường lên đỉnh GVR" competition and won, becoming an exclusive rapper for GVR. The following year, he changed his stage name from Young Crizzal to Rhymastic and transitioned into professional work by experimenting with and perfecting his recording, vocal processing, and songwriting skills. He graduated from the Hanoi University of Architecture and worked at the M4Me studio with artists like JustaTee and Young Uno. He described the job as simply pressing record for clients for a salary that was "enough for pocket money and iced tea." However, Rhymastic noted that this was an opportunity to learn about music and "build a massive foundation of sound knowledge."
Career
On October 31, 2011, SpaceSpeakers was founded, and Rhymastic became one of the group's original faces. In 2013, after Karik faced heavy criticism from the underground scene for deciding to go mainstream, Rhymastic, along with Binz and BigDaddy, spoke out in his defense. This led to several "beefs" between Rhymastic and rappers with differing ideologies. During this time, Rhymastic also had disagreements with GVR member Linh Lam and officially left the group to focus on SpaceSpeakers.
In 2016, a conflict between Rhymastic and B Ray led to a rap battle. He released several diss tracks in response to B Ray, such as "Bản Kiểm Điểm," "Ngược Đời," "B Ray Dissin," and "Ếch Báo Dissin." Rhymastic competed in the second season of "The Remix" as the music producer for Team 04 (alongside members Soobin Hoàng Sơn, Antei Ngọc Thịnh, and Gin).
In 2017, he released "Yêu 5," which received positive feedback from the music industry and ranked high on Zing MP3. At the end of the year, Rhymastic participated in "Sao đại chiến" as a producer, partnering with singer Hoàng Tôn. The show featured singers, bands, and producers challenged with reinventing old songs. He had a heated debate with Dương Cầm during a live broadcast.
In 2019, he was invited to be a judge for the Beck'Stage battle.
In the following years, Rhymastic continuously released products offering multi-dimensional perspectives on life. In a 2020 interview with Billboard Vietnam, he stated he would limit his participation in personal rap beefs because "as you get older, the time you have for those things gets narrower and narrower."
Also in 2020, Rhymastic became a judge on the show Rap Việt.
Rhymastic also composes for other singers, including "Sâu trong em" (Bích Phương), "Nơi ta chờ em" (Will), "Let Me Feel Your Love Tonight" (Trà My Idol), and "Tình yêu tuyệt vời" (S.T Sơn Thạch).
In 2024, Rhymastic appeared in the reality music show Call Me by Fire Vietnam, winning the "King Of X-Part" award and becoming a member of the "Gia tộc toàn năng" (All-Powerful Family) lineup.
In 2025, Rhymastic became a main member of "Gia đình Haha"—a reality TV show promoting the unique cultures of various regions in Vietnam.
On October 22 of the same year, he released his debut full-length album, "Đâu ai yêu nghệ thuật đến thế" (Who Loves Art That Much). The album consists of 10 tracks, representing Rhymastic's journey of questioning the true value of art and fame, and the sacrifices an artist makes while overcoming loneliness, pressure, and temptation to maintain their true self. This project was nurtured by Rhymastic for many years, marking the first time he fully exposed his inner world and his gritty alter ego, YC.
Controversy In 2020, the simultaneous debut of two rap talent shows, Rap Việt and King of Rap, inadvertently sparked intense and unnecessary debates within the rap community. In October, Rhymastic made comments that were perceived as belittling King of Rap, despite having previously spoken out against comparing the two shows. A few hours after the incident, Rhymastic publicly apologized to the entire King of Rap crew as well as rap fans, while also agreeing to settle things through music if requested.
Personal life In 2018, Rhymastic officially married Lai Thanh Huyen after their engagement ceremony. They held their wedding on April 10, 2019. On July 11, 2020, the couple had their first child, Vu Uy Vu, nicknamed Ma Bu.
Discography
Studio albums Release dateTitleTracklist10/22/2025Đâu Ai Yêu Nghệ Thuật Đến Thế Tiền Tươi Thì Sao? (ft. Touliver) Funk You Up All The Fans Câu Đùa Nhạt Cảnh Giác (ft. Lil Wuyn) Đâu Ai Yêu Nghệ Thuật Đến Thế Same Shiet Day Diff Liều (ft. Touliver) Khó Hơn
EPs (Extended plays) +Release dateTitleTracklistFormat11/12/2022Lov6 Y6u (Yêu 6) Líu La Líu Lo Side Effect (ft. B-Wine & Touliver) Ngổn ngang Vẫn Yêu Thêm Đứa NữaCassette
Compositions YearSong TitleRelease DateArtistNotesAround 2002–2006Rap verse in the skit "Alo 123"Công LýComposed during middle school2012CầnSeptember 19, 2012Rhymastic, Soobin Hoàng Sơn2013Vẽ KhóiDecember 10, 2013Rhymastic, OnionnMV was removed from YouTube following an official dispatch regarding music activity regulation2014D.C.M.EMay 1, 2014Hoàng Touliver, Andree Right Hand, Rhymastic2016Người Và Ta2016Rhymastic, Thanh HuyềnNếu Như Một NgàyAugust 7, 2016MIN, RhymasticLet Me Feel Your Love TonightSeptember 16, 2016Trà My IdolTừng Ngày Em Mơ Về AnhJuly 26, 2016MLee, Soobin Hoàng Sơn2017Em Là Của AnhMarch 10, 2017S.T Sơn ThạchSong from episode 8 of The Remix (Season 3)Nơi Ta Chờ EmApril 28, 2017WillSong from the movie Em chưa 18 (Jailbait)Yêu 5May 20, 2017RhymasticKhi Ta Có NhauJune 18, 2017WillVinh Quang Đang Chờ TaJuly 27, 2017Touliver, Rhymastic, SOOBINOfficial song of Garena Arena of Valor in Vietnam In 2019, this song was reused to cheer for the Vietnam sports delegation at the 30th SEA GamesNgày Trôi Qua NhanhJuly 29, 2017Anh Tú AtusTreasureAugust 23, 2017RhymasticSeptember FlowerOctober 3, 2017Trà My Idol, Hoàng TouliverHai Thế GiớiDecember 25, 2017Will2018Khi Màn Hình TắtApril 10, 2018RhymasticPhán XétAugust 8, 2018Nến Và HoaAugust 19, 2018Đây Là Việt NamNovember 15, 2018Rhymastic, BlackaCheering song for the 3 Vietnamese teams at the Arena of Valor International Championship 2018, co-written with BlackaTình Yêu Tuyệt Vời (Perfect Love)December 17, 2018S.T Sơn ThạchEverydayMay 8, 2018SpaceSpeakersCo-written with JustaTee2019Trên Lầu CaoFebruary 12, 2019RhymasticRide the TideJune 26, 2019Rhymastic, KimmeseOfficial song of Arena of Valor World Cup 2019Ngọn Đuốc ĐêmJuly 27, 2019RhymasticLang ThangDecember 31, 20192020Vinh Quang và Nước MắtFebruary 10, 2020Giang PhạmOfficial song of Viettel 5G Arena of Valor Spring 2020Vì Một Việt NamFebruary 19, 2020Hoàng Touliver, Soobin Hoàng SơnNụ CườiApril 7, 2020RhymasticCảm Ơn BạnMay 30, 2020Hoàng Thuỳ LinhGiàu SangJune 23, 2020RhymasticCứ Chill ThôiJuly 11, 2020Chillies, Suni Hạ LinhTượngNovember 16, 2020RhymasticRap battle with Lê Quý Kỳ Phong (Torai9)Let Victory Make HistoryNovember 20, 2020Rhymastic, GDuckyOfficial song of Arena of Valor International Championship 20202021Cả Ngàn Lời ChúcJanuary 7, 2021Suboi, RhymasticTúi Ba GangJanuary 10, 2021Phương Ly, RhymasticCả Nhà Lên ChứcJanuary 27, 2021RhymasticBị Bass Bỏ BùaJune 19, 2021Rhymastic, Trấn ThànhSong from Rap Việt All-Star 2021Freaky SquadNovember 30, 2021SOOBIN, Binz, Rhymastic, Hoàng TouliverCo-written with Binz and Hoàng Touliver2024Hỏa CaJune 28, 202433 male artists in Call Me by FireTheme song of the show Call Me by Fire Wrote rap lyrics with Đinh Tiến Đạt, Binz, Neko Lê for the composition by It's CharlesLặngJuly 6, 2024RhymasticPerformed in the show Call Me by Fire Season 1Khiến Nó NgầuRhymastic, Đinh Tiến Đạt, Hà Lê, BinzCo-written with Đinh Tiến Đạt and Binz while participating in the show Call Me by Fire Season 1Chợt Nghe Bước Em VềAugust 3, 2024Rhymastic, People's Artist Tự Long, Đinh Tiến Đạt, Quốc Thiên, Cường Seven, SOOBINWrote additional rap lyrics for the composition by Quốc Vượng while participating in the show Call Me by Fire Season 1Những Kẻ Mộng MơAugust 10, 2024Rhymastic, People's Artist Tự Long, Tuấn Hưng, Quốc Thiên, Tiến Luật, SOOBINWrote additional rap lyrics and new lyrics for the composition by Nguyễn Bảo Trọng while participating in the show Call Me by Fire Season 1Thu HoàiAugust 24, 2024Rhymastic, Đinh Tiến Đạt, Hà Lê, Quốc Thiên, Tiến LuậtWrote additional rap lyrics for the composition by 14 Casper and Hoài Thanh while participating in the show Call Me by Fire Season 1Đêm Cô ĐơnSeptember 7, 2024Rhymastic, Quốc ThiênWrote additional rap lyrics and new lyrics for the composition by Trung Kiên while participating in the show Call Me by Fire Season 1BaySeptember 28, 2024Rhymastic, Đinh Tiến Đạt, Đỗ Hoàng Hiệp, Thanh Duy, Quốc Thiên, Tăng Phúc, Liên Bỉnh Phát, Thiên Minh, Duy KhánhWrote additional rap lyrics with Binz for the composition by Nguyễn Hải Phong while participating in the show Call Me by Fire Season 1Đỏ Quên ĐiOctober 5, 2024Rhymastic, Đinh Tiến Đạt, Đỗ Hoàng Hiệp, Thanh Duy, Quốc Thiên, Tăng Phúc, Liên Bỉnh Phát, Thiên Minh, Duy Khánh, Tiến Luật, Hà Lê, Bùi Công NamCo-written with Binz, Bùi Công Nam, Hà Lê, Đỗ Hoàng Hiệp while participating in the show Call Me by Fire Season 1Bống Bống Bang BangOctober 12, 2024Đinh Tiến Đạt, Tiến Luật, Thanh Duy, Quốc Thiên, Duy KhánhWrote new lyrics with Binz with rap lyrics written by Tiến Luật, Đinh Tiến Đạt, Thanh Duy, Duy Khánh for the music composition by Only C, Nguyễn Phúc Thiện and lyrics by Lou Hoàng while participating in the show Call Me by Fire Season 1Quá Là TrôiĐỗ Hoàng Hiệp, Binz, Rhymastic, Thiên Minh, Hà Lê, Bùi Công NamCo-written with Đỗ Hoàng Hiệp, Binz, Rhymastic, Hà Lê, Bùi Công Nam while participating in the show Call Me by Fire Season 1 SKYNote (Thiên Thanh)October 13, 2024Quốc ThiênDebuted at Quốc Thiên's SKYNote concert in HanoiNụ Cười KhoẻDecember 29, 2024Rhymastic, Dương Hoàng Yến, Ma Bư2025Giữ Sức Khỏe Em ƠiFebruary 8, 2025Đông Nhi, RhymasticNhững Ngày Trời Bao LaJune 12, 2025Rhymastic, Bùi Công Nam, Jun Phạm, Ngọc Thanh Tâm, Duy KhánhTheme song of the show Gia đình Haha (Haha Family)