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)