Gu Chaomu is the real son in a switched-at-birth story. His biological parents found him when he was sixteen. They told him to get along with the boy who had been raised in his place, but they favored the fake son at every turn.
Gu Chaomu worked hard to put down roots in the wealthy family, not for affection, but for money. He could do without family love, but he wouldn't accept getting less than what was rightfully his.
No one was going to take even a cent of his money from him.
But just one month after he was brought back into the family, he was diagnosed with a terminal illness.
As he despairingly waited for death, something claiming to be a gossip System came to him. [Host, as long as you complete the gossip check-in tasks, I can cure your terminal illness.]
Gu Chaomu: [I'm in.]
So when the Gu family held a banquet, everyone looked down on the unloved real son. Gu Chaomu's father pinched his nose and took him around to make social calls.
Gu's father: "This is your Uncle Li."
Gu Chaomu: "I know, I know. He met his mistress in secret, then his wife kicked him out of the room naked. He fell and chipped a front tooth. He lied to you and said he'd just had too much to drink and fallen."
Uncle Li: "W-w-well..."
Someone came over to provoke him. "Do you really have the nerve to take Ranran's place?"
Gu Chaomu didn't even look up. "Oh, sure. Like you have any room to talk. You found forty-nine stand-ins for Gu Qiran, made them pretend to be him, and slapped yourself every night."
The man: "You..."
At school, someone taunted him. "What right does a country bumpkin like you have to study with us?"
Gu Chaomu kept working on his exercises and replied, "Oh, your dad's bringing his illegitimate child home to claim his place in the family right now."
The man rushed home at once.
Gu's mother: "How can you compare yourself to Ranran?"
Gu Chaomu listened to English through his headphones. "Mm-hmm. Your Ranran is moving your assets around right now."
Gu's mother screamed and stormed off.
Gu's father: "What about you makes you look like my son?"
Gu Chaomu sipped his milk. "I don't know if I'm your son, but that newborn of yours definitely isn't. Your young girlfriend and her boyfriend are planning how to trick you into bringing their child into the Gu family."
Gu's father: "What?!"
Gu Chaomu lived by the idea that it was better to make other people suffer than to turn his anger inward. He made everyone fear him. They were all terrified that one day Gu Chaomu might reveal their secrets.
Gu Chaomu: Come on, who's afraid of whom? He's going to die anyway, so what does he have to fear? If anyone makes his life miserable, he'll make sure they die of embarrassment.
Someone: "Interesting."
Theme: Where there's a will, there's a way