I don't know where to start as my head is full of emotions, yes that was an emotional roller coster (btw I love roller coasters and so I'm definitely in love with this one!!!)
It starts slowly and it is itself a slow brewing series. Everything is slowly unfolding and we have so many details to pay attention to but it's such a pleasure to keep guessing this riddle every single episode.
When it comes to the plot I'll just say the it's a love story, the most beautiful one. Eternal and faithful, the love that can cross the time and the memories that should be the one that created it, pure and stubborn love, everything else is impossible to explain, just watch it!
Let me talk about the actors. It's my first time meeting Alice and Greg but I already had a pleasure of seeing Patrick. I am mind-blown by their acting ! Especially Greg, he definitely had a hard nut to crack as he had so many of himself to act as (can I just insert here a very random thought? - I loved this tiny LGBT+ moment, so cute, so pure, so brave and so sad in the end..." ). He is hella talented, what I loved about his acting was not only how he portrayed Li Zi Wei / Wang Quan Sheng (which I love sooo much, their bright personality, their clear heart and honest character along with the stubborn love that they were brave enough to pursue) but how he shown us their every emotion thru his eyes and his facial expressions. I could see how much he struggled, how much he was in pain, how happy or in love he was, that was Li Zi Wei / Wang Quan Sheng not Greg Hsu anymore.
Alice was amazing too, you know how talented she is when she brings so many emotions depending who she's porting at the moment. She can make you angry, sad, frustrated, happy, envious and many more, with her and Greg you'll go thru the kaleidoscope of emotions.
Maybe Patric didn't have such an extreme challenge like Greg and Alice but his character is not less liked by me, without our Mo Jun Jie this series wouldn't be able to connect, he is as important as Zi Wei and Yu Quan. BTW Zi Wei and Jun Jie friendship is definitely goals!!!
For the first time I'll talk about music... I want to say that this ost is already on my mac and iPhone and my family is already throwing me side glances as they have enough of "someday or one day" - which I'm obsessed with. But truthfully
it's hard to choose the best song as all of they were just so good plus so well matched with the drama!

If you don't know if you want to start it, then just start watching already! But you will not be able to have your easy drama with a simple plot, to have all the answers you'll need to wait all the way thru 13 episodes, but isn't it the best recommendation? Just go for it!!!!