He would send the music he made to people he thought might listen to his work, including The Black Label.

[4] Lee also worked as a model, posing for W Korea and for the brand of Korean designer Choi Moo-yul, Vlad Vladis.

[6][7] In 2020, Lee participated in Blackpink's The Album; he is credited as a co-lyricist on three of the eight tracks - "Pretty Savage", "You Never Know", and "Lovesick Girls".

Additionally, Rosé, on her 25th birthday, surprised her fans by uploading on her personal Youtube channel three covers of songs by Coldplay, Neck Deep and Oasis, with the help of Lee playing the acoustic guitar.

[23] NME regarded his album as "a collection of defiant alternative rock anthems, soaring guitar riffs inspiring the kind of adrenaline that comes with a battle for survival.

Put Up a Fight allowed him to express the frustration from the public eye and how quickly people have an opinion about somebody just because someone else says so, and also about the self-doubt he faced while writing the album.

[4] The songwriters and performers he most admires are Julian Casablancas, Jack White, Damon Albarn, Liam Gallagher, Kurt Cobain, and Pete Doherty.

[30][31] In an interview with NME, he talked about how music helped him throughout his teenage years, as the message of freedom of speech and opinions charmed him.

[24] (with 1999 Write The Future) All song credits are adapted from the Korea Music Copyright Association's database unless stated otherwise.