I think Ah Li knew that Mimi is hiding something or he already knew that Mimi is not fully cured from the disease and is making everything that he can to research the alternative cure other than consuming the gem heart. And I'm gonna trust Nunu's decision that we'll get a happy ending for this timeline. We need to stay positive ಥ‿ಥ
Spoilers***
I think Ah Li knew that Mimi is hiding something or he already knew that Mimi is not fully cured from the disease and is making everything that he can to research the alternative cure other than consuming the gem heart. And I'm gonna trust Nunu's decision that we'll get a happy ending for this timeline. We need to stay positive ಥ‿ಥ