I must say that I felt a little intimidated after reading the synopsis. Dealing with my own set of mental health issues I wasn't sure if this was going to be super heavy and a tough watch. But today I finally went for it and wow I loved it!
Something about this short series just really made me love it.
The story was simple, not a lot happens and yet it was everything I wanted it to be. I definitely didn't feel weirded out by the relationship at all, which some people in the comments mentioned.
Wu Zeng just had that feeling of someone who would grow old with you nailed down, no matter the hardships and wavering feelings he wouldn't just be your lover he would be there as your companion. So much so that the energy shift from the flashback was really apparent even without needing any dialogue. It made me really wish to find someone with that same energy. It was such a well done performance by both actors.
I also loved how even though he didn't really understand it, the grandpa gave his best support.
There was no weirdness around the same sex relationship, which left so much space for the actual storyline.

The only thing that took a point away from this show was the random side story in the last episode that had no reason to be there. There was no build up, explanation or resolution. It just existed.
Absolutely loved it and will probably rewatch it from time to time.