This drama is definitely a good K drama classic cliche reminder. Once in a while I remines the dramas I grew up watching.
The ones that you have to ignore all logic like:

Kid hits girl in rain. next scene:
Boy in court room over the incident. Girl runs into the courtroom soaking wet "from that rain"
Like did you NOT go to the hospital first? Did you just got dragged straight to the court room w/o any due process?

So just enjoy the classic cliches:
Poor orphan girl <-- check
Piggie back rides <-- a must
Accident losing memory <-- always
Everyone lies to you when you have no memory as if that's good for you <-- yup
Obsessive girl on the side wishing nothing but the worst <--- essential
Stalker Obsessive behaviors - Ok if you are a cute ML
First love = Fated eternal love <-- check. I mean who wants to watch the 98% failed first relationships anyhow like in real life.

Now whether you enjoy those or not, there are lovely things about this drama:
1. Young versions (which I thought should've lasted longer) are the most adorable parts of the drama
ML in the teens <-- I watched his later works first and wanted to watch his earlier works. He's definitely my favorite part of the drama
2. 20s ML - I watched his supporting roles and he's one of my favorite supporting actors.