The Strongest Dull Prince's Secret Battle for the Throne - Chapter 649: Destruction

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

A story about a man that died with a lot of regrets. Follow him as gets a chance to rewrite his story and do right by those whom he fails in the past. Follow his journey as he embarks on the road to becoming The Greatest Of All Time, The Goat, The singularity. Of the beautiful game of Football

After 20 years of dedicating his life to opera ever since he had quit the performing arts high school, he had failed at an interview. Losing his motivations, Jo Yunjae depended on alcohol to live out his days until one day, he had been sent back 20 years in time, to the day before his high school admission.

I returned after 10 years.