It took me a while to finish this drama. I genuinely liked all the characters. The plot just felt draggy at times. And the time travel bit felt confusing at times (near the middle/end) that I had to go read summaries after an episode to understand what happened.
The best parts were when we got to see happy moments with the FL and the ML/SML at their high-school. Their friendship was amazing. The relationship between the FL and ML was also pretty cute even in the future. It makes you want to have a relationship :') The plot twists really leave you in awe once you figure them out.

The best characters were probably the FL and ML. Chen Yu Run (SFL??) is pitiful. Mo Jun Jie is kinda dull but also... pitiful. Zhi Qi and Zhong Ru were interesting!!

The ending is bittersweet and ambiguous! It hints at something but its not enough to hold onto unless you watch the special ending (mini) episode which kinda makes it feel better :)