Both dramas have a calm strong FL, played by the same actress, and a mature ML leading a group of warriors gathered for a purpose with great bromance between them.
Both dramas have bold FLs protecting the balance between the demons and the human world, and reserved but devoted MLs who are officials. The ML in You Have My Heart was also in Moonlit Reunion.
Both are fantasy dramas with a strong flirty FL and a reserved ML who becomes very devoted. Both MLs also have the same voice actor.
Both dramas are about warm youthful friendships with fun wholesome characters. When We Were Young is about high schoolers in the 90s, Be with You is a martial arts costume drama.
Both dramas have two couples, with one of the FLs pretending to be a man. In Wrong Carriage, Right Groom, FLs marry each other's fiances. In The Letter from the Cloud, FLs have a fake marriage with each other.
Both dramas have sismance with the same actress. In The Glory, she is FL's bodyguard, in The Letter from the Cloud she's a cross-dressing scholar, who has a fake marriage with FL.
Both dramas have FL and ML clearing goals in a game environment. In Love Scenery ML helps FL learn a game. In Oops! Almost Broke Up ML and FL are stuck in a game like time loop. Both dramas have celebrity themes, too.
Both second chance dramas with sci-fi theme. In Filter, FL uses a bracelet that helps her to change her appearance and starts working with ML, her high-school crash. In Oops! Almost Broke Up, FL and ML get stuck in a time-loop game after they decided to break up.
Both dramas have the same actor and actress as ML and FL. In Nine Yin True Sutra they end up becoming a villainous couple.
Both dramas have FLs who lost their families and grew up to be resilient. They're outgoing, bold and confident. Also, both have medical background and a childhood connection with ML.
Both Wuxia dramas with master FL and disciple ML. In Love of the Divine Tree, FL is a sect master, in Qingchuan's Veil of Vengeance, FL is a general.
Both dramas have a FL pretending to be a man. They're scholars with calm personality. They then get married and treat their wives in a very gentlemanly way.
In The Letter from the Cloud, both the wife and the husband are the FLs, and they have their MLs as well.
In The Cross-Dressed Union the wife is the ML who is also cross-dressing.
In The Letter from the Cloud, both the wife and the husband are the FLs, and they have their MLs as well.
In The Cross-Dressed Union the wife is the ML who is also cross-dressing.

