To the Beautiful You (2012)

both cross dress stories. similar characters. both are very light, and fluffy, more suitable for a younger audience

-They both have a CReEPILY similar vibe, despite the plot being totally different
-They both take place in a very new, modern, brightly colored and unfairly spacious boarding school (although, Kim Bok Joo's is a college (so, duh, they live there) and To the Beautiful You's is a boarding high school)
-The best friends are the best part (side only to the romance if you're more into that thing)
-Both revolve around the main characters' sports and a primary plot line is training or overcoming some (or several) sport obstacle(s)
-They both feature rhythmic gymnastics as a sort of side plot (and the participants are always the mean girl)
-Both have a strikingly similar ratio of humor to drama; the humor being of the same type/style, and the drama relating to the mother of the male lead
-For some reason the school's doctor is a friend/somewhat needed side character that falls in love with one of the two lead's siblings
-Even the originally bad characters become lovable
AM I THE ONLY ONE WHO SEES THIS??

they are both have a gender-bender genre

Tae Joon became Jae Hee’s strength during her toughest time, and she leaves the US for Korea to enroll in a men’s physical education high school to help Tae Joon restart his high jump career.
Tae Joon announces his retirement from the high jump national team and closes his heart, but his closed heart begins to open after meeting Jae Hee.
Eun Gyul is confused about his sexual orientation as he falls in love with Jae Hee who is masquerading as a man. The student-athletes have a fun time training with each other and are not tied down to setting a record or competition.

"Baby Steps" revolves around Maruo Eiichiro, a punctual and earnest boy who has strived for straight As since elementary school. The 15-year-old high school boy stops by a tennis school to deal with his lack of exercise. There, he meets Takasaki Natsu, a beautiful, earnest girl who only has a passion for tennis.

There two dramas share very similar traits, such as; school based, a romance that starts badly but grows through out, sports and competition. I liked Sassy go go, however I felt like it was missing something that I definitely found in this TTBY. Also, attractive people in both (Just saying ;p).

They both have a main lead who has a concealed identity. Both male leads are athletes and there is also a second male lead that will melt your heart.

A young girl named Joo In Hyung, suffering from her past experiences until a group of mysterious men suddenly enter her life. The fantasy romance drama touches on dreams, love, and friendship.

Hua Yang Shao Nian Shao Nu is the Taiwanese adaptation of the Japanese manga/drama Hana Kimi. To the Beautiful you is the Korean version.

Since the original story of Hana Kimi is so good, I suggest watching all the other adaptations too!

Tae Joon became Jae Hee’s strength during her toughest time, and she leaves the US for Korea to enroll in a men’s physical education high school to help Tae Joon restart his high jump career. Tae Joon announces his retirement from the high jump national team and closes his heart, but his closed heart begins to open after meeting Jae Hee. Eun Gyul is confused about his sexual orientation as he falls in love with Jae Hee who is masquerading as a man. The student-athletes have a fun time training with each other and are not tied down to setting a record or competition.

The similarities lie in --- Takes place in high school
Popular male lead
Female lead dresss as a guy

Both adorable which feature the two high school aged love interests living together. Serious second male lead syndrome in both.

In TTBY Tae Joon is a popular athlete and Jae Hee is the new girl. In GMC Uehara is one of the "top three" (most popular and handsome) in his school and Nao is a quiet less popular girl with a heart of gold.

Lee Jang Suk spent some time in a juvenile detention center for stealing wallets from unsuspecting strangers. After he gets out, he meets a sports agent, Nam Jae Il, who's trying to recover from a downfall in his career. Together, they work to achieve their dreams. Jang Suk dreams of becoming a K-1 Champion; and Nam Jae Il dreams of regaining his reputation as a top sports agent.

Tae Joon became Jae Hee’s strength during her toughest time, and she leaves the US for Korea to enroll in a men’s physical education high school to help Tae Joon restart his high jump career. Tae Joon announces his retirement from the high jump national team and closes his heart, but his closed heart begins to open after meeting Jae Hee. Eun Gyul is confused about his sexual orientation as he falls in love with Jae Hee who is masquerading as a man. The student-athletes have a fun time training with each other and are not tied down to setting a record or competition.

In both dramas you can find the female lead and the male lead living together and fall for each other. And also, in both dramas the female lead chase the male lead.