The drama is not BE for the main couple!! Qingyi was dying but eventually lives, it's heavily implied when he 'sees' his loved ones but they tell him to stand up and return to the mortal world.

Found the below on X, the intended ending that didn't come to fruition due to filming time constraints. This is what's supposed to come after the scene of Qingyi looking at his loved ones, before his dream of the alternate 'what if'.

https://x.com/i/status/2085056667209945353