It's actually the opposite how they handled the break-up. Everyone surrounding Choi Ung witnessed how he was in pain and had a downfall. On the other hand, Yeon Su handled it by herself showing everyone she's alright but deep inside it killed her too.
Also, I love how romance unfolds in this drama. Another reason to fall in love with Choi Woo Sik once again.
It was said by Yi Hyun that it's not automatic you get infected once you take NEXT. You may or may not show symptoms. Which is I think needed another explanation which they failed to do in storytelling.
I totally agree with the character development thing. We needed backstories not only from the leads but all of them. Yet they only showed Andrew's. There is no character justification also the writing had so many loopholes.
You can say the production is lit when they literally casted 3 different generations of young/teen Black&White who also slayed in acting esp those twins in the hanky scene.
INK SUPREMACY Y'ALL.
Also, I love how romance unfolds in this drama. Another reason to fall in love with Choi Woo Sik once again.