Heartbeat Conquest

When Da-Eun wakes up, she finds herself in a dating simulation game as Diana, a pretty schoolgirl surrounded by beautiful people with floating hearts above their heads. To her surprise, there seem to be no rules beyond the ability to conquer anyone, regardless of their gender, age, or even species -- yes, even dogs have heart-o-meters! Dating is fun, sure, but Diana has something else in mind… the ultimate goal of the dating sim genre -- to form a harem. She starts to strategize, but will things pan out as she plans?

(Source: WEBTOON, edited)