Sovereign of the Karmic System - Chapter 581 - A Case Not Expected

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

Park Moonsoo worked REALLLLLLY hard in life before dying.

Scheming female assassin transmigrated to become the weak Eldest Miss, her story is wonderful and stunning, attracting peach flowers to blossom open. Cold calculating emperor? Genius bad crown prince? Insidious happy-go-lucky prince? Gentle physician? Ice-cold mystery male? Who is her true love? Haha, but she only eats, definitely will not take responsibility! Beautiful men be careful!

- Description from Novelupdates

Indra (5) grew up in her family while being shunned and ostracized. When she regained the memories of her previous life, she decided to run away from home and thus trained herself to absurdity.

During her training, she encountered the young adventurer Sword, who looked just like a middle-aged guy. Worrying about the impertinent, eccentric, pointlessly strong young girl, Sword invited her to go on a journey with him.