The reason Ren He looked so bizarre was that the Divine Punishment System suddenly spoke up, but it wasn't about rewards; it was about punishment!
"Host has received a poor evaluation for completing the task, and is consequently punished with a three-day lisp," said the Divine Punishment System calmly.
Ren He was completely dumbfounded on the spot, okay? It wasn't that he hadn't completed the task, but that his completion of the task was rated poorly! Damn it, a lisp for three days!
What's the situation, had he not invited a female classmate? Had he not gone to the dance? Why would he still get such an evaluation?
Could it be that the Divine Punishment System required him to dance with the opposite sex other than Yang Xi? That he couldn't just do other stuff? But you damn well didn't specify that, did you!