I think Lomon deserves an award for his outstanding performance through out the show. I never missed his Drama. I watched almost all he starred starting from The Guardians (For Dramas) and Horror Story III (For Movies).

There're some reviews and comments about the Ending! I personally think that Ending is justified because if they tend to expand the ending sequence, it might end up becoming another episode with running time less than 28 minutes and if they follow normal k-drama standards then the runtime can either be 45 min or 60 min.
Moreover, sometimes the approval of episode length depend on Disney+ based on their requirement. I understand that last 20 minutes of the show actually handled bit faster than expected - From Jaebum's Arrest to Ji Soo's exit (from school with Chan Mi.

There are so many favorite scenes in the show especially the Ep9 ending sequence when Jaebum is revealed instead of Ji Soo with the background song (Lost Game).

According to me, It has high re-watch value with it's take on several characters in the show.
Overall,
Story - 10/10 (It is actually good, A Person with Tumor in his last days taking care of mother who is hospitalized and also helping the girls who were traumatized with bullies and Ok ChanMi finding the murder of her brother)
Acting - 10/10 (Ji Soo, Chanmi, Osung, Jaebeom, Kookji,Tae So) - Every actor on the show did good.
OST - 10/10 (All the Songs are good)
Rewatch Value - 10/10

Don't miss the show. It keeps you at the edge of the seat while watching intense scenes.