Every Day the Protagonist Wants to Capture Me

Transmigrated into the body of a cannon fodder villain, Chu Yu has three major worries:

1. How can he help the protagonist turn into a real harem master?
2. How can he develop a good relationship with the protagonist?
3. How can he live properly without holding on to the protagonist's thigh?

The protagonist has three major worries:

1. Eldest brother changed
2. Eldest brother really changed
3. How can he marry eldest brother?

System: congratulations! ~ sprinkle flowers ~ grow old together happily!

Chu Yu: ... Wait, what about the harem novel?

Author's note - This 1vs1 (no harem) and HE (happy ending)