Lighter

Twelve Letters and Last Letter both center on the power of written words to connect hearts across time. Each uses letters as a bridge between past and present, blending nostalgia, mystery, and emotion. They share a quiet, reflective tone, showing how even simple messages can carry unspoken feelings and change lives.

Mary Kills People and Hyper Knife both follow morally complex female doctors who break the law in the name of medicine. Both leads are emotionally guarded, driven by obsession, and operate in high-stakes, ethically twisted environments where saving lives comes with a cost. The tone is dark, stylish, and psychological, full of tension, control, and blurred lines between right and wrong.

this is also a thriller etc and based around students and events, it also matches the vibes like bullying, fighting, action, etc students around each other

Reason: This drama involves high-stakes action and intrigue, similar to Project Y. It follows a high-profile detective and his team as they deal with crimes that affect the elite class.

Reason: This series offers a mix of comedy and mystery with a detective duo solving complex cases, creating a dynamic and engaging storyline similar to the investigative elements of Project Y.

Why Similar: Vagabond follows a similar action-packed and suspenseful storyline involving covert operations and high-stakes conspiracies. The show features intense action scenes and a gripping plot.
Plot: A stuntman discovers a hidden conspiracy behind a plane crash and embarks on a dangerous journey to uncover the truth.

Why Similar: This series involves high-stakes heists and complex plans, similar to the strategic elements in Project Y. The show offers a mix of action and suspense with a gripping storyline.
Plot: A group of robbers with distinct codenames plan and execute a massive heist in a unified Korea.

Why Similar: The Guest blends supernatural elements with a suspenseful narrative, creating an intense atmosphere. The show’s themes of uncovering hidden truths align with the conspiracy elements in Project Y.
Plot: A priest, a detective, and a shaman team up to fight against evil spirits and uncover dark secrets.

Why Similar: Signal combines crime thriller elements with a complex narrative involving secret investigations and mysterious events. The show also features an intriguing storyline with twists and turns.
Plot: Detectives from different time periods communicate through a mysterious walkie-talkie to solve cold cases and prevent crimes.

its also about mystery and uncovering the truth plus jdrama..................................................

Its also about mystery and police officer and is also a jdrama.......................................