J.One, and ‘Back Then’
Han (한) is a member of Stray Kids, the eight-member group under JYP Entertainment. When he formed 3RACHA with Bang Chan and Changbin as a trainee, the name he put on his songs was J.One (Soompi, 29 June 2018).
On the mini album THIS & THAT of 7 August 2026, all eight of whose songs 3RACHA wrote, the track where Han’s share is clearest is ‘Back Then’. Sports Kyunghyang reported on 5 August that Han had written its lyrics and music alone, and Asia Economy wrote the next day that he had led the work on it. Seungmin sang it.
Songs he sang alone
His solo song on the digital album SKZ-REPLAY, released on 21 December 2022, is ‘런’ (Reon), the English word run written in Hangul. SPOTV News introduced it as a song that offers the listener comfort.
He has also sung for dramas and series. Sports Kyunghyang reported on 28 October 2025 that Han had sung ‘GENIE’, a track on the soundtrack of the Netflix series Genie, Make a Wish, with Felix and I.N. According to the same report and the Korea Herald, ‘상승기류’ (Sangseung Giryu), a title that means an updraft, the theme song of tvN’s drama Typhoon Family, was the first soundtrack he had sung alone since his debut, and it was released on 26 October 2025.
‘back to life’
In 2026 the first song of SKZ-PLAYER, in which the eight members release songs they wrote themselves in turn, was Han’s ‘back to life’. According to Star News, it was first shared on the group’s official social media on 9 May, and in the music video he plays instruments himself amid dizzying scenes. The Korea Times reported on 11 June that the song, which Han wrote and composed alone, would be released as a digital single at 6 p.m. that day, and wrote that its lyrics carry a resolve not to lose himself.
Soompi reported on 15 June that the Italian house Tod’s had chosen him as its new brand ambassador.
Three months later, on his birthday, 14 September, he sent 100 million won to the social welfare foundation Angel’s Haven. Half goes to the protection and psychological treatment of children who have suffered abuse, and half to the upbringing and education of the children of Eunpyeong Cheonsawon. “I wanted to offer even a little warm comfort to the hearts of children who have been hurt,” he said (Star News).