I’m Sick, but She Doesn’t Believe Me (Quick Transmigration)

[The main story is told in third person]

I was bound to a Supporting Female Character System. The System said that if I completed missions, I could earn experience points to treat my illness. My mission was to trip up the female lead, make everything go wrong for her, and ensure she was schemed against at every turn.

I rubbed my hands together, ready to sharpen my knife and go after the female lead!

After a while, I put the knife away because the female lead was so clueless that I couldn't bring myself to hurt her. So I decided to muddle through, play along, and fool the System into giving me experience points so I could survive. But the female lead really was clueless. I told her I was sick, and she refused to believe me. She insisted on treating me as her best friend and even gave up the male lead for me.

Watching her silly, smiling face, I touched my wicked heart and lowered my head with a sinister grin: I can't keep doing this mission. She's just too adorable! I want to date her...

World One: I have skin hunger, but she doesn't believe me... So I cling to her like crazy every day!

World Two: I have lovesickness, but she doesn't believe me... So I go see her every hour!

World Three: I have a fetish for objects, but she doesn't believe me... So I start "collecting" her little dresses!

World Four: I have delusions, but she doesn't believe me... So I write steamy little stories about the two of us!

World Five: I have...

Theme: I want a sweet romance