Recommendations

Shinohara Ryoko once romanced ex-Johnny's hottie Jin Akanishi in this romantic comedy

hottie idol Kamenashi Kazuya falls in love with a beautiful older woman

Same genre ~ younger man falls in love with an older woman ~ romantic comedy

Ueno Juri and music! two different genres of music but both are still fun and light. There also Takenaka Naoto playing the role of a mentor in both

There are several similarities:
1. Main guy is a genius detective (or consultant)
2. The girl herself is not the run-of-the-mill bumbling, naive idiot- but actually smart herself; (well to a certain extent in the case of I Remember You).
3. There is a serial killer who keeps trying to lure the main guy

Obviously, there are many differences (far more in number than the similarities) but both are worth watching at least once.

BONUS: Love Me If You Dare has the most amazing AI that you can't help but fall in love with. That sass level and his banter with Wallace!

These movies are similar because both have young men some how becoming the caretakers of a baby. The male-leads both struggle with their new found responsibilities as a father and also have romantic side-plots. Overall they both have a similar feel with the comedic elements and feel-good family vibe they share.

It's also with the same actress and about getting pregnant and all the complications involved to raise the child after her husband die.

Another arranged marriage /period lakorn. The male lead had ex-wife syndrome and the female lead had a lovelyboyfriend but they end up to marry each other. Then the lakorn shows us typical hate/ slow burning love relationship between main protagonists.

Another arranged marriage lakorn with ex-girlfriend syndrome followed by evident slow burning love. Perfect chemistry between lead actors.

Both involve cooking theme, with lead character trying to achieve their goals through cooking,Both involve the journey of young men to master the art of cooking

It's another adaption of the same series, expect it a remake of the original Japanese one. Though I would recommend watching all of the remakes if you enjoy this one.

Both Entertainer and Perseverence, Goo Hae Ra are about the creation of a new music band.

They're Kamen Rider series that has the primary Kamen Rider as a detective and involve them solving case that involves the antagonists. The main characters of each series are very well liked and brings a very cool or should I say hard-boiled feeling to them.

They're very similar in many ways to the point that Kamen Rider Agito was originally supposed to be a sequel of Kamen Rider Kuuga. They both have a dark tone to the series, though Kuuga is much darker.

They are practically the same drama, the only difference is STH is way less quieter.