In novels, there's always a hapless tool of a male lead: the male lead's number-one backup, his personal ATM, and a top-tier simp among a million!
When the male lead flirts around, he graciously forgives him.
When the male lead needs money, he hands it over without hesitation.
When the male lead's friends and family pick on him, he cowers and keeps quiet.
The simp is a brick: wherever the male lead needs one, that's where he gets carried.
Nan Yuejin wakes up one day with a Simp Male Lead System.
The System tells him: [As the first male lead, you must give everything for the protagonist!]
Nan Yuejin: What the hell are you talking about? I've never bowed my head to anyone in my life!
It's not like I have some weird fetish where I can be happy inside while being cheated on!
Nan Yuejin starts slamming on the brakes with the System and tearing up the script!
Modern wealthy-family world
As the heir to the most powerful family, Nan Yuejin's script is to be the male lead's patron and stepping-stone. While the charming, flirtatious, tea-loving, universally adored male lead Zhou Xuanliang juggles all sorts of men, Nan Yuejin is supposed to be the jealous tool who sends him gifts and makes him look good. His shameless simping is meant to make the cannon-fodder male leads feel threatened and compete to spoil the protagonist, until Nan Yuejin hands over his family fortune and lets the protagonist claim the throne as the main male lead.
But now Nan Yuejin looks at the protagonist, who still has other people's kiss marks on his neck and is putting on a pitiful act for him. He gives a cold laugh and slaps him.