https://www.novelupdates.com/series/cheering-on-my-love-rival/

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There's a saying: the male lead is for the female lead, and the second male lead is for the audience. What happens when the male lead and second lead fall in love?

Cheng Junjie's guilty pleasure is romance novels, and he always roots for the pitiful supporting lead who inevitably fails to win the heroine's love. One day, he wakes up as the male lead of a novel he was reading. "This time, I'll protect the second male lead's feelings!" he declares.

CJJ: Come, there are other fish in the sea! Don't tie yourself forever to a woman who doesn't love you!

2nd Male Lead: You're right! You're the one I really love.

CJJ: Something seems to be wrong with the plot...