The World's Finest Assassin Gets Reincarnated in a Different World as an Aristocrat: Season 1, Episode 11

1 - 11: Choice of Betrayal

Lugh is hired to assassinate Dia by her father Count Viekone, who is an old friend of Lugh's father Cian. Cian asks Lugh to fulfill Count Viekone's request, saying he'll carry out the assassination instead if Lugh turns down the job.