Oh my goodness the MC is absolutely adorable. He ticks all my boxes. Imagine solo leveling but the protagonist is kim dokja. You've got yourself a guy who can copy any one skill from a person who has killed him and return 24 hours to the past afterwards. He also has knowledge from like 10 years in the future. There's a really good mix of drama and comedy to add on to the typical power fantasy, so I can't recommend this enough. EDIT: *sigh* romance... It was nice while it lasted I guess.
SSS-Class Suicide Hunter