OP MC worth the hype!!

Gang Jinho lived 2 unhappy lives. He committed suicide on his first, and was betrayed on the second. So when he woke up and found himself back on his first body, he convinced himself that this time will be different and he will be happy.
But old habits are hard to change, and supressing it is a difficult feat. He was once, after all, called the Demonic Master --- the cruelest leader of all time.

Caution: Romance ahead.

Ch: 100+

When King Grey, one of the most powerful rulers of the empire, reincarnated as the son of two commoners, he is determined to not go on the same path as before. He no longer wants to live a life devoid of purpose or love.
But when mysterious events kept on happening his way, he questions if the Gods have another reason to bringing him back to life besides pity.
Novel: https://www.readlightnovel.org/the-beginning-after-the-end
Ch: 100+

Eun woo had a twin brother who died in the tower. No, he didnt die because of the monsters within, but he died at the hands of his comrades.

Striken with grief and resolve, he vowed to get revenge on them. He took his brother's identity and went inside the tower.

Ch: 100+
Rate: ★★★/☆☆

Ki Mok, one of the only 44 people worldwide to own the Blood of Gold, fights of Dokkaebis after they started to fulfill an unknown person's wish.

The wish?

Kill all the students.

Ch: <50
Rate: ★★★.5/☆

He was an addict that betrayed all those around him. Now on the lowest point of his life, he chose to go to Lost Paradise to find his true self.

"Come closer my child, the fool who has awakened.
Take up your arms and fulfil your rightful duty.
Reignite your star of fate and seize the day.
Let those who scorn you know...
The son of god Gula has returned."

Official novel: https://www.wuxiaworld.com/novel/the-second-coming-of-gluttony
Ch: 100+
Rate: ★★★.5/☆

Kim Jihyun's past life as a surgeon is filled with heartaches and tragedies. On the lowest point of his life, a deity took pity on him and decided to turn back time. With the knowledge of the future and the determination to change, will he finally become happy on the second round of life?

Caution: Romance ahead but its cute so dont go for ma girl!

Ch: 148 (complete)
Rate: ★★★★/☆

Dawun, with only a useless power to purify things, was supposed to die at the dungeon that day. However, during the reset of the dungeon's first level, a bug was encountered on his system. He is not affected with it and retains all his materials, power levels and experience!

Ch: 100+
Rate: ★★★/☆☆
Note: He is the happiest mofo MC in this list and genre lmao

Note: A Harem tag was added recently, but so far nothing in the actual storyline leans on to that. Based on the comments, one of the novel's side stories stated that he had about 17(?) wives. So I guess they put it because of that. But the thing with side stories is that it usually happens once the story ends. I dunno lol. Will delete from the list if it starts to gets cringy.

Ch: 100+
Rate: ★★★.5/☆

Rood, the youngest and one of the strongest magician of the empire, was sent on a secret mission to protect a young noble's son --- but a once simple mission turned into a sinister event that will eventually bring harm to him and the empire itself.

Author dropped this gem :(
But still it is too good not to be shared around!

Ch: 200+
Rate: ★★★★/☆