While You Were Sleeping (2017) is a pleasant and well-acted Korean drama, written by the same scriptwriter, Park Hye Ran, who wrote the masterpiece I Hear Your Voice, and both dramas starred the same attractive young male lead actor, Lee Jong Suk (Pinocchio, Secret Garden, W, Dr. Stranger). Both dramas had elements of fantasy about them — in one Lee Jong Suk’s character could read people’s thoughts when they looked into his eyes, and in the other, he could enter the dreams of his soon to be girlfriend, played by Bae Suzy (Dream High, Big) and learn about and protect her from negative events that could potentially harm her or cost her her life, or that of her friends and loved ones.

Speaking of Seung Ho Yoo, his performance as a lawyer/prosecutor was far more seriously contemplative in Remember (2016) than Lee Jong Suk’s here in While You Were Sleeping, and Seung Ho Yoo is several years younger than Lee Jong Suk, to boot! I really think the writer was between a rock and a hard place here considering the casting of Bae Suzy, who seems to be better at comedy than drama. Given the seriousness of several of the situations in this drama, it may have been a finer drama if they laid off the comedy to a large extent and focused more on melodrama, just like the superior Remember did. In that respect, even I Hear Your Voice achieved a far better blend of melodrama with comedy than While You Were Sleeping. The occasional comedy never overwhelmed the main serious theme of that drama.

Jung Jae Chan (Lee Jong Suk) is a young, new prosecutor who, despite being a bit cold on the surface, has a good heart and a good eye for bringing righteousness and justice to various legal cases, and he lives with his younger brother who is still in school, Jung Seung Won (Shin Jae Ha, Page Turner).
Jae Chan quickly and inexplicably takes a liking to his new, pretty, and perky neighbor Nam Hong Joo (Bae Suzy), an inexperienced, often unemployed reporter living with her mother Yoon Moon Sun (Hwang Young Hee) who runs a pork restaurant, and whose disturbing dreams serve as a reflection of future events to warn her about potential dangers to her life.

More detailed review here: https://bookswithnatasa.home.blog/2021/09/12/should-watch-26-while-you-were-sleeping/