It was an assassin MC being reincarnated after the MC's family was murdered and got revenge, along with a friend. I remember that the MC had found an old temple and talked to a goddess in it, getting a quest for revenge and was joined by another man in the process. I remember that the sister was shot by a sniper, and the MC proceeded to search her body. The MC and other guy were reincarnated after a challenge with cards.
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