[Quick Transmigration] I Keep Accidentally Flirting with the Villain

Chang Mi found a very easy part-time job. Lately, Hosts in high-difficulty mission worlds had been suffering a sharp rise in accidents. To keep them safe, someone needed to terminate the mission as soon as a Host's life was in danger.

The System assured her, "Those people are powerhouses who sweep through mission worlds. Why would they need anyone's help? We just have to follow along and cheer them on, and we'll be fine."

Chang Mi thought that made sense.

After she officially started the job...

The powerhouses she was supposed to protect: "Why does the person beside our buddy look so familiar? Holy crap, isn't that the ultimate final boss from the mission's story?"

Chang Mi, innocently: "I really didn't know he was the big villain."

She gets a supporting character's script and lives the protagonist's life. With a lazy System in tow, she reaches the Host's peak.

The heroine: "Hold on. I don't think this is going quite right."

A taciturn, slightly obsessive hero x a kind, warm-hearted sweetheart heroine

Other notes:

The hero and heroine are each other's only partners, physically and emotionally.