Good Morning Call (2016)

From the 1st episode of Konin Todoke ni Han wo Oshita dake desu ga, I feel its so familiar plot story.
The ML fall in love with someone that he couldn't have it (his sister in law).
The ML have little bit the same character. The FL have limit time to stay together with the ML.
They have the same basic rule. Don't fall in love by each other when they live in the same roof.

Both cute goofy female leads who are attracted to a
"colder" male lead.

Both have two people ending up living together because of a situation and ending up falling in love with one another.

Two high schoolers share a house, fall in love, and the male lead is super cold and aloof. Kiss Me's main man, played by Mike D'Angelo is a much better character and softens over time.

Both feature smart ML and not so smart FL. Both have ML end up tutoring FL at some point. In both the ML and FL end up living together and try to hide it. In both the ML teases the FL. ML acts indifferent towards FL. There are many more similarities.

Well-meaning but socially awkward, Kuronuma Sawako is nicknamed "Sadako" by her high school classmates because of her similar hair style with the main character from the horror movie "Ring." She doesn't have friends and goes about her day in quiet. She admires a fellow classmate, Kazehaya Shota, because of his easy-going and friendly nature, but unknown to her, Kazehaya has also been paying attention to her.

They both go to school and both end up living together - and of course falling in love. The main lead is also smart and tsundere.

Both adorable which feature the two high school aged love interests living together. Serious second male lead syndrome in both.

In TTBY Tae Joon is a popular athlete and Jae Hee is the new girl. In GMC Uehara is one of the "top three" (most popular and handsome) in his school and Nao is a quiet less popular girl with a heart of gold.

I recommend pretty much all adaptations of Itazura na kiss. The personalities of the leads and some elements of the plot are very similar.

They are both fluffy and about a forced living situation, friendship and the male leads are both arrogant and cold.

Well-meaning but socially awkward, Kuronuma Sawako is nicknamed "Sadako" by her high school classmates because of her similar hair style with the main character from the horror movie "Ring." She doesn't have friends and goes about her day in quiet. She admires a fellow classmate, Kazehaya Shota, because of his easy-going and friendly nature, but unknown to her, Kazehaya has also been paying attention to her.

In both the series they live together. In the beginning they don’t like eachother and in the end they love eachother.

Second Part, Duh!!!
The story picks up with the leads now navigating college life. Their bond, once forged in high school, is tested by new challenges—demanding classes, social circles, and the freedom of campus life. As they face personal growth and evolving dreams, their dynamic shifts, oscillating between friendship and something more. Moments of jealousy, late-night confessions, and unexpected twists create a rollercoaster of emotions. Will their connection survive the trials of college, or will they grow apart? This chapter dives deeper into who they are becoming and what they truly mean to each other.

ML is an actor but not too popular anymore & broke so he rent a room in FL house.
FL is a nerdy geeky/otaku girl who like to imagine & day dreaming about romance with her favorite manga/comic book character. Remind me of Rainie Yang & Jiro Wang drama....& still 1 of my favorite drama....If you like this genre this is a must watch romance comedy drama....

Miyu and Shuya are high school students. They have dated for 2 years. Miyu and Shuya have a promise that no matter what, they will watch a movie together on the first day of each new month. When Miyu and Shuya are on their way to the movie theater, Shuya suddenly cancels their date. Shuya seems like he is hiding something and he acts nervous. Later, Miyu goes to the place where she is supposed to meet Shuya, but she witnesses Shuya getting into a car accident. She panics, but when she wakes up she finds herself on the morning of the accident. Miyu keeps waking up on the day when Shuya got into an accident.