Recommendations

They're part of the same series and go to the same high school (Zhen Hua High School).
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It just that the story, the set-up, and even the bromance reminds me of each other, just that if you want something short and full blown bromance then go watch Till Death Tear Us Apart..

Both are time travel, family dramas. In both the older version of the ML meets the younger version of his parent/parents. I myself liked TNF more.

The two main comedians Hamada and Matsumoto started their tv careers on Gaki no Tsukai before starting Downtown no Gottsu Ee Kanji.
Many people from Downtown no Gottsu Ee Kanji make appearances on Gaki no Tsukai.
Expect to see much of the funny comedy style and crazy stunts in Gaki no Tsukai.

The harmony of action and romance in both of the dramas are great! Although I want to say that while CLOY is on more on the romance side, Vagabond is more on the action. The chemistry between the actors is better in CLOY and the story is focused on their relationship. In Vagabond the romance stays in the background but the action scenes are too good and definietly worth watching. Also the male leads in both of the dramas turns into unstoppable warriors when it comes to protect what they care about. And female leads are strong in their own way too. Both of the drama gives power couple vibes which I personelly loved.

Same as She Was Pretty's description although, the Second Male Lead Syndrome might be even stronger in Pretty Li Hui Zhen : ( Lol but anyways Pretty Li Hui Zhen also gives out an life lesson so I mean Ig watch it if you decide to watch She Was Pretty and could bare through the Second Male Lead Syndrome in that one, and if your coming from there watch My Little Happiness for a not so frustrating character, good chemistry and excellent chemistry between Second Couple and want a drama to heal your broken heart xD.

-Both Male lead and Female Lead's were childhood friends
-Both Male Lead used to be overweight as a child but grew up to be really hot.
-Both Male lead likes Female lead since childhood, though in she was pretty the female lead liked him since childhood too
-In She Was Pretty, Male lead does not recognize female lead, in My Little Happiness It is the female lead
-In She Was Pretty, it was female chasing after male...
-In My Little Happiness, Male lead chases after Female lead and potentially falls for her first ( Since its unknown if she liked him since Childhood too)
-Both leads have the same feel
-Both leads become a cute couple after knowing the truth
-In She was pretty, Second Lead Syndrome hits hard
-In My Little Happiness, second couple syndrome hits hard xD...
-In My Little Happiness, there are very very very toned down Love Triangles xD
Watch My Little Happiness if you don't want to cry your heart out for Choi Siwon and also don't want to slap Female lead lmao, with cute couple and also watch My Little Happiness for the Second Couple (Who are the best part of My Little Happiness imo )
Watch She Was Pretty, For a great Second Male Lead, A pitiful and nice Second Female Lead, cute chemistry with both Second Male lead and Male lead, a Jerk male lead, and Oblivious Female Lead
-She Was Pretty also has a better moral message in My Little Happiness uptil now all I see is foreshadow hot kisses but no true moral and is a steamy romance
-She was pretty has more of learning moral to it again : )
-Both are good, I prefer My Little Happiness because of Second Couple Syndrome and the reason because She was pretty made me avoid dramas with love triangles lmao.

I felt that Run On depicts picturesque landscapes and somehow even One Spring Night gives off the same vibes when it comes to weather and landscapes.

Also, I really like the contrast in the dramas where Run On shows the beauty of the day especially the morning and One Spring Night makes the dark look pretty and somehow uplifting.

Both 'Haeundae Lovers (2012)' and 'Woman of 9.9 Billion (2019)' feature Kim Kang Woo and Cho Yeo Jung as the main leads.

It is helpful if you press the "Voice Actor" Tag, this is another cdrama that has a similar premise. The FL's profession has to do with voice acting and the couple connects through related work.

Gen Y has a combined cast of Superboy Project and SBFIVE. The main leads played by Kimmon (SBFIVE) and Copter(SBFIVE) have great on screen chemistry and the story for Gen Y focuses more on just the romance between the two main leads.

It has some of the members from the superboy project in it. It it short but sweet and Pon and Bank are the main leads

The main character in both movies had to confront with someone out of their league (in terms of fist fighting) for the sake of the woman they love. Both are adapted from "seinen manga" and good at portraying the anger and frustration of the main characters.

While the premises are very different, the feel of it was similar.

You have the "life back then" aspect of it; you get to experience how life was back in 1998 in Taiwan. You also have the family and friend aspect of it; you get to see the friendships developing and turning into more, as well as the relationship with the family improving. As well as the heartfelt feelings between the leads, the patience and the love.

That being said, 1988 is purely a "slice of life" drama vs. Someday also has a time travel element, as well as a murder mystery added to it.

Both of these dramas are excellent, and highly recommended.

The two male leads have the same dynamic in both dramas, where they're both fighting and the girl gets in the middle.