Hide their relationship when they are together / dating:
- Into the Ring - Coworkers - the Ml is the FL's secretary.
- Lucky's First Love - Coworkers - the ML is the FL's boss.
- High School King of Savvy - The ML is the FL's boss but actually he's a high school kid pretending to be his older brother while the FL is an adult.
- Search: WWW - They don't work for the same company but the ML's company has a business relationship with the FL's company. They also slept together the day they met and the FL is embarrassed about starting a relationship that way.
- Love in the Moonlight - The ML is the crown prince and the FL grew up as a poor orphan living as a boy. She continues to pretend to be a boy when she enters the palace as a eunuch. It turns out that her father was a rebel leader who attempted to lead a rebellion against the ML's father.
- Moon Lovers: Scarlet Heart Ryeo - The FL first falls for prince A who is married. Prince A also falls for her, and his wife is terminally ill and later dies. Prince A abandons the FL. The FL is supposed to marry the Emperor but she wounds herself and is punished by becoming a palace maid instead. This still makes her the Emperor's woman and "off limits" to anyone else. The FL falls for prince B and he falls for her, but they hide their feelings and later their relationship because prince B's enemies would threaten the FL if they knew about their relationship. The FL never marries prince B. They both marry other people - the ML marries the prince A's sister and the FL marries prince C - but the FL still loved prince B and was pregnant with his child when she left him.
The leads hide or deny their feelings due to a taboo or similar reason before they get together, or they get together but then separate for the same reasons:
- Doctors - They develop feelings for each other when the ML is the FL's high school teacher. They separate at that point knowing the relationship is wrong. They meet again after the FL completes medical school.
- The Princess Wei Young - The FL believes the ML's grandfather is the mastermind behind the massacre of her family and subjugation of her kingdom. Later on, the ML has to pretend to hate the FL and agrees to marry someone else in order to save the FL's life after she is framed for murdering his mother. Near the end of the drama the FL has to pretend to abandon the ML (keeping the fact that they still love each other and are plotting together a secret) and agree to marry his uncle in order to defeat the villain.
- Crash Landing on You - The leads mostly suppress their feelings because they know there is no way that they can happily stay together. The ML is a captain in the North Korean army, his family is all in North Korea, and he is engaged. The FL is a successful business woman from South Korea.
- Coffee Prince - The ML mistakes the FL for a boy and under the circumstances the FL runs with it. When the ML falls for the FL he questions his sexuality and tries to suppress his feelings.
- Sungkyunkwan Scandal - The FL dresses as a boy in order to make money as a scribe, and later in order to attend an all boys school. Thinking the FL is a boy and knowing that being in a M/M relationship would bring her harm (her reputation, she would likely be kicked out of the school, and potentially worse harm) he hides his feelings.
- The Imperial Doctress - The ML is the emperor and married when he meets the FL. The FL marries his brother. They generally suppress their feelings. The ML confesses his feelings when they are in a life or death situation but they don't get together at that point. They actually don't get together until the very end of the drama after the ML's son is old enough to take over the throne.
- A Piece of Your Mind - The ML's first love dies. The FL was sort of friends with her and tried to get her and the ML to rekindle their old flame before she died. The ML has a device that captured her voice and sort of her consciousness (the details / mechanics are really unclear) before she died. The FL hides her feelings from the ML and from the device since his first love just died.
- Where Your Eyes Linger - BL romance where the MLs grew up together and one is the other's bodyguard. The bodyguard doesn't think the other ML likes men, he doesn't want to jeopardize their friendship, and he knows the other ML's father would not approve of them being together, so he suppresses his feelings.
- Lost Love in Times - The ML is a prince and the FL is a sorceress. The sorcerers are forbidden from having romantic relationships with the royal family. The leads fall in love and get married anyway. This triggers a prophecy and tragic destiny. The FL uses her powers to sort of reset the timeline / sort of go to an alternate reality where things are slightly different, the ML hadn't met her yet, and she is the only person who remembers the original timeline. She has to hide her feelings for the ML in order to prevent the same tragic fate from occurring again.
- Before We Get Married - The ML has a fiancee and the FL has a long time boyfriend. By the end of the drama they are both single but they don't actually get together. It's strongly implied that the ML will ask the FL to date again and this time she will be ready to accept.
- Dream High - The FL is in a relationship when she falls for the ML. She is extremely guilty and tries to suppress her feelings.
- The King in Love - The ML is the SML's bodyguard. Both the ML and the SML fall for the FL. The FL admires their friendship and becomes their friend. She falls for the ML, but holds back her feelings because she doesn't want to ruin the friendship between the ML and SML and because she's unsure of the ML's feelings. The ML hides and tries to suppress his feelings because he always defers to the SML, who is the crown prince and his best friend and who has openly shown his feelings for the FL.
- Boy For Rent - The ML has a girlfriend and the FL hires the ML to gain experience because she has a crush on a guy who doesn't like childish girls.
