In both dramas FL is a modern girl trapped in a video game whose aim is to find love. In both dramas, FL has several admirers and our ML is a handsome prince.

FL is a persecutor in OTW and a lawyer in TLC. ML in TLC is a persecutor.
In both cases FL is bold, straightforward,empathetic, wear vibrant clothes, and temperamental.
Both FL defend the oppressed and fight againt the evil CEOs from a powerful corporation related to the family of ML.

In both cases FL is the book writer and ML is the villain and they fall in love. In "Fall in Love in the Book" FL enters in the book world. In ”Mr. Bad" the character gets out from the book to our world. "Fall in Love in the Book" is a class B mini-series but the plot is comprehensible for their 5 minutes episodes. "Mr. Bad" is a drama with 45 minutes episodes and there is more character development.

Today’s Webtoon is a Korean remake (2022) of the japanese drama Juhan Shuttai from 2016. Though it conserves the same structure I find delightful to witnesshow differently the two directed constructed their stories. In the Japanese version FL starts with thejob interview and is directed admited. The korean version seems solid but as up to now Viki has released only 2 episodesfrom each of thesetwo dramas, I shall come back fora better comparison.

The same concept that the character dies and come back to the plot for a different version. In hoth cases FL is ar ghe same time the scriptwriter and the FL from the subplot and ML start despising FL for larer falling in love with her.

In both drama, the second lead is a writer whose identity is hidden from the public.
Main leads were suffered together abuse in the childhood and they have deep psychologic scars from that experience. In childhood ML protected the girl in both stories, ML in these shows were chaebols while FLs lived in low to middle class families.

Park Seo Joon is the 2L in KMHM and First lead in WWWSK. And in both shows there is a strong chemistry between the main leads .

WWWSK has a lighter vibe but they are both excellent dramas,

Both are focused in a girl with a fate related to demons and their love story with a cold and powerful immortal and have to face strong opposition from the "dark side" and from possessive and strong ladies loving MLs.

In SWAS , ML is not immortal but the reincarnation of a man cursed by his lover in a past life and they meet again falling in love and healing their karma. SWAS is a mini serie.

Secret Angel has the following points in common with Hi! School - Love On :

In both dramas, there is a female angel protecting a guy because of an accident and they eventually get in love. Their love is deep and pure leading to many cute moments. Moreover in these stories there is a jealous female opponent to the naive angel, the ML’s best friend who is secretly in love for him.

HSLO however is a youth romance, they are in high school. This is not the case for Secret Angel.