I did watch Go Ahead when it aired and really enjoyed the drama and it's poignant storyline and acting. When I heard there was a Korean remake, it prompt me to start watching it when it aired as well.

Overall, it's okay. I think what disappoints me is all the important parts of Go Ahead was watered down especially the talk between Sanha and his mother after Sanha started dating. However, both mothers were definitely a pain in the ass. The Korean mother seems to be screaming way too much. She seemed to be screaming over every little thing.

Yun Ju Won played by Jung Chae Yeon is a bubbly girl who tends to be very positive about her family dynamic. I enjoy watching her act. Unfortunely, due to how short of a length this drama was, I felt like her relationship with Sanha was not natural. One minute, she feels digusted by Sanha's confession, the next minute she had a pivotal moment, and suddenly she's in love with Sanha in a romantic way. It just felt like something was missing, in my opinion, they should've just stayed siblings. I couldn't find a connection between the two, in facts its the same for all couples.
One moment they're being rejected, the next they're together! The pacing is just too quick for me to connect with their emotional scenes.
Sanha played by Hwang In Yeup. There's not much to say about his acting, he has subtle facial expressions which he portays nicely. But overall, his character is just bland. Not to say the Chinese counterpart wasn't bland, both were bland. lol But what makes the Chinese counterpart better is the scriptwriting. For example, as aforementioned, the argument between Sanha and his mother. In the original, the mother argues that Ling Xiao cares more for his neighbors more than his real family, Ling Xiao shouts, "They love me, why don't you love me?" That was the heartbreaking moment for me, and I was expecting this to happen in the Korean version but it didn't come. The Korean version was lackluster.
Kang Hae Jun (Bae Hyun Seong) seems to have anger issues compare to his Chinese counterpart. I understand he felt abandoned, and angry that everyone was trying to protect him in their own way. But anger is not needed in certain scenes. The actor's ability to cry was very natural though.
Overall, the acting of everyone was okay.
Due to kdramas being only 16 episodes, everything was cut short so it made it difficult for me to connect with the characters. I felt like they should've marinate the emotional scenes a bit more.
I also want to point out something. Was this a low budget drama? Why are 2 of Sanha's classmates ALSO doctors and why is it always these three treating the main and second leads? Yun Ju Won's cafe feels like it's her home cafe because barely anyone is ever there! LOL??? The setting felt unrealistic basically.

Overall, what really made this adaption fall short, at least for me, was the poor script and pacing.
I wouldn't recommend this version if you watched the Chinese version.
If you didn't watch the Chinese version, I would recommend that if you want better script and emotion connection with the characters compare to a fast pace adaption of it. The choice is yours.