Both have FLs who are chefs (or aspiring), and who are creative and innovative with new dishes. Both have a strong focus on ingredients and recipes with beautiful, colorful shots of food. Both FLs star opposite cold MLs.
Both MLs have a flirty, swaggering personality toward the FLs with a lot of naughty jokes and invitations, which covers up a deep love for the FLs. You know... if you're into that kind of thing. :-)
Both of these jdramas feature older woman/younger man romances, and both have male leads that are dancers. The progression of the romance is fairly similar, but Second Love is a lot faster with intimate scenes.
The romance in The Crown Princess is similar - with its very restrained noble love, "never step out of line before we're free to be together" vibe, but it's more extreme in the Crown Princess. Both involve court intrigue, military men, lovely costumes, and couples determined to put the whole kingdom before their own love interests. Crown Princess is a hate-to-love, but Legend is not.
Both movies have the same kind of 0 to 100 mph intensely passionate romance, though it starts more slowly/awkwardly in the Intimate Lover. Both deal with infidelity and have mature scenes, but Obsessed has more artfully done ones. These are good movies for watching couples deal with sudden, overwhelming attachment to one another.
The intensity of emotions in Obsessed reminds me of Secret Love Affair. Both deal with infidelity and marriage. However, Obsessed is mature with explicit scenes, and Secret Love Affair also has a large age gap. Both have flawed characters who ultimately become subject to their own choices.
Both have the same dynamics with an inexperienced, low self-esteem girl and a dominant male that chases first. In Coffee & Vanilla, the FL is more timid and fragile, but older and in college. Both have sexy moments, but Coffee & Vanilla is definitely for a more mature audience. However, the chemistry in Black Devil is stronger.
Both of these dramas involve dreaming, and have supernatural elements. Dreamland is more Inception-like, however.
Both are career-oriented FLs who are "putting off" dating due to their careers, or as the plot suggests, in denial that they need romance.
Both have FLs that are career-oriented, and both are working on dating apps. The FLs are forced to suddenly face their romantic future and how it relates to their careers.
Both are pretty mature dramas with women dating multiple men, and both deal with infidelity in some way. Busujima has an additional theme of politics and journalism, while Fukigen focuses entirely on the romance and dynamics between the friends.
Same ML if you like Sakurada Dori, and he has just about the same persona. In Perfect Crime he's more angry, though, and the romance is dark, not sweet. The FL is the same in that she easily gives over to a physical relationship, and is a bit of a pushover in her interactions with every one else. Both are heavy on intimate scenes.