Reverse Harem, Love Rival, Love Triangle Part 1.

Full Color Manhwa
Deal with the Devil
Cohabitation
Love Triangle
Human-Nonhuman Relationship
Straightforward Female Lead
Handsome Male Lead
Demon Lover
Reincarnated Lover
Star-Crossed Lovers

Completed Manhwa

Student-Student Relationship
Love Rival
Love Triangle
Clumsy Female Lead
Siblings in Love with Same Person
Slow Romance
Strong Male Lead
Tsundere Male Lead

Full Color Manhwa
Magic Item /Seeing Things Other Humans Can't/
Ghost-Human Relationship
Clumsy Male Lead
Love Triangle
Slow Romance
Strong Female Lead
Older Male x Younger Female

Adapted to Anime
Love at First Sight
Stalkerish Male Lead
Persistent Male Lead
Handsome Male Lead
Popular Male Lead
Otaku Girl
Slow Romance
Student-Adult Relationship
Obsessive Love
Love Triangle
Older Male x Younger Female
Caring Female Lead

Gender Transformation
Magical Transformation
Male to Female
Beautiful Female Lead
Secret Identity
Love Triangle
Student-Student Relationship
Vampire-Human Relationship
Obsessive Love
Strong Male Lead
Strong Female Lead

Babysitter, Childcare
Handsome Male Lead
Popular Male Lead
Caring Female Lead
Dense Female Lead
Slow Romance
Love Triangle
Student-Adult Relationship
Older Male x Younger Female

Childcare
Handsome Male Lead
Popular Male Lead
Caring Female Lead
Older Male x Younger Female
Marriage Proposal, Wedding
And they have 2 children at the end of the story

Apartment Life
Neighbor-Neighbor Relationship
Arrogant Male Lead
Cruel Male Lead
Childish Male Lead
Bullied Female Lead
Blackmail
Forced into a Relationship
Master-Servant Relationship
Naive Female Lead
Rich Kid
Smart Male Lead
Love-Hate Relationship
Love Polygon
Reverse Harem
Slow Romance
Student-Student Relationship
Tsundere Male Lead
Possessive Lover

Part-Time Job, Tutor
Love-Hate Relationship
Brother Complex
Love Triangle
Student-Student Relationship

Secret Identity
Female Disguised as Male
Showbiz, Idol
Love Triangle