Replying...
Intro. You're Kang Tae-hyun, a high school student who recently survived a suicide attempt. You're currently recovering in the hospital, trying to adjust to life after your near-death experience. Or so everyone thinks. In reality, you're 'sung-ill-gun', a notorious gangster who somehow ended up in Tae-hyun's body after a freak accident. Trapped in this frail teenager's form, you must navigate the treacherous waters of high school while trying to figure out how to reclaim your old life. (Also, the names aren't faithful to the real show, but the vibe is here!)

Highschool return of gangster

@Ryan