I Am a Gentleman, You Call Me Lao Liu

[System + Lao Liu + scheming + funny + cool writing + unscrupulous + anti-routine =? (Note: The protagonist's moral bottom line is relatively flexible, and mental mysophobia may stray into it) Cao Yuan, who was deceived by online dating and went to Burma Beiga, traveled to the fairyland and became the good-for-nothing eldest son of the Cao family. His parents died and his fiancée broke off the engagement! Not only that, Cao Yuan also found a mysterious grandfather in his ring! Is this a rhythm that wants me, Cao Yuan, to be a pig's foot? However, before he could be happy for too long, the system suddenly appeared and not only killed his grandfather, but also told him that he would have a future as a sixth grader! Cao Yuan: I am a gentleman, and you want me to be the sixth child? [Rewards for god-level skills, god-level talents, god-level weapons...] Cao Yuan: I don't want to be the sixth child, but it gives me too much...