I thought it was Yuan who can change fate.
Who is Yuan?
Yiyi is yuan
Maybe they meant Yiyi thats the only person i could think of
Pretty sure yiyi is a nickname rourou gave him and other people started calling him, idk
Aha, thank you for telling me. I thought his name is Yiyi, turns out it just only a nickname (◕ᴗ◕✿)
Great-Grandpa : "I need to meet with the person who can change the fate"
The one who changes the fate (Rourou) : "Eat fried chicken in his dreams with Big Head and Yiyi"