Cheonjae Baeuui Aura

Struggling actor Yu-Myeong Shin has spent the last 15 years of his life trying to make it big, but has always failed to. After a devastating cancer diagnosis, he’s drowning his sorrows when a Yeon-Gwi, an acting ghost, appears and offers to send him back in time and with an added boost of life energy to start his career over. Yu-Myeong leaps at the chance and becomes a college student once more, running into Ryu-Shin Seo, his one-time rival. But this time, Yu-Myeong has the acting chops to back him up, and even Ryu-Shin will have to acknowledge him!

(Source: WEBTOON, edited)