Honestly Lee Jong Suk character feels incomplete feels like his character was just there as a showpiece (maybe will see his character storyline in part3)
Also the lady who save her and her brother maybe hopefully they show in part 3 that she at least choose boy for treatment and he's still alive because it will be sad to see the one who helps the FL in part 2 got died as in part 1 (the couple and her classmate) were alive...
If I have to rate part 2 I'll rate it 3 stars
As for me part one was 5 stars