The writer back to past life and be the main character there.
And the male lead is a sinner too..
At first the female lead fall in love with another man.

Brothers love same woman.
Luo zheng was in this drama as well.
Brothers who are not close to each other due to tragic past.

Prisoned.
Campus life.
Love separated.
Senior - close family relation - tryin to make a move .....
Popular male lead.. rich female lead

Campus life.
About ict / programmer
Business starter
Women family prefer other guy.
Rich woman poor man

Brothers love same girl ...
Both good looking...
Kinda sad drama...
Prepare your tissue...
...
Mental issues

- You didnt know who is the main lead (if you dont watch spoiler, poster, etc)
- Possessive male lead

The way they struggle for their love is kinda similar to delightful girl, choon hyang. The emotion and feeling feel the same.

Idol school is a survival show under MNET in order to create a new girl group. The girls were trained in a school by the popular trainers such as Kim Hee Chul. This show created a rookie girl group named FROMIS

SIXTEEN was also popular survival show created by JYP. This survival show was created in other to produce a girl group named TWICE.

The similarity is both show produce huge girl group, not only korean but included Japanese.