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They have a similar theme and videos/photos as an important plot element...I would say more but it would be a spoiler, watch them both and you'll understand. ;)

Both have the main couple entering into a marriage against their will. The female lead in both agrees for family reasons
(to save her father's house in Full house while to save her family from loan sharks in Goong). Also, the male lead still loves his ex at the time in both.
What starts out as an unwilling relationship turns into love- with teasing, arguing, jealousy along the way.

Both ...

-have the same backdrops of WW II on Japan
-have Inoue Mao in the same role as a wife waiting for her husband comeback from battlefield
-are story-telling style drama/movie

because both drama consist of idols... im sure youll like it :) and youre beautiful is also fun like EXO next door both of theme is realistic

It is the sequel to Five Deadly Venoms. Originally Crippled Avengers is named The Return of the Five Deadly Venoms.
It's even better than the first.

It's also about receiving a heart transplant from someone and falling in love with their spouse/lover..

Kwak Sun Young gets into a car accident and develops this ability of detecting a man's past from his body odors. She divorces her husband when she finds out about his long history of girlfriends. Sun Young then sets up a business where she helps women and even the police track down suspicious men and husbands.

Both are comical + political satire romcom in the parliament and government.

Both are dealing with a student falling in love with an older guy. In both movies characters are mentally tortured because life isn't going easy with them, but thanks to their beloved they still manage to get through it.

Both are about girls who come from a humble background and then become royals. Both male leads are infatuated with another girl in the beginning of the drama.

Written by the same person, both dramas have a very fresh take on relationships and the identity of women and men in society.

It also takes place at a school. There is murder and it makes you think a lot and gets you curious.

Both dramas revolve around siblings and other family members. The series reveals the life, loves and ambitions of each individual and the routes they choose to take to achieve their goals. Both dramas were humorous, but had enough serious content to balance the series. Excellent cast; you may have a hard time picking a favorite.

Both are period pieces with intense emotions. Acting is brilliant in both.

in both a woman travels back in time and fall for a guy there.
in tawipob the mirror is gate of travel.