Locked Onto You

Detective Ganghui encounters Hajun, a world-famous designer who looks exactly like her late boyfriend, Yujin. He even wears the matching ring Ganghui and Yujin had shared. Hajun seems to know what's bothering her but won't tell her the secret behind the uncanny resemblance. Instead, he keeps persuading her to date and later marry him. Now Ganghui has two options: follow her heart and fall in love with that man or follow her head to find out the truth about him. Oh, wait. Maybe, just maybe... she'll be able to choose both.

(Source: Webtoon Entertainment)