The real question is FL will definitely have ML, childhood friends, ex bf, and rich ceo.
Unfortunately, it seems that he'll be a simp. Based on the trailer, it looks like he'll be the one doing the chasing, experiencing rejection, and feeling jealousy. It's clear that the target audience was very obvious from the beginning. Any men with backbone would not behave like the male lead did.
Did he get cured? Are they both happy and alive at the end including the kid?
He is not cured. If the cure had been given to him sooner, he might have been saved, but because he has been poisoned for so long, it cannot be cured now. In the final scene, he stands alongside the dead, foreshadowing his own future death. The ending is bittersweet. They do not have a child together, and the conclusion feels rushed.
He dead, but in the future, final episode and him standing on the dead side was kinda foreshadowing. The physician said even immortal cannot cure the poison. So its bittersweet ending.