Both dramas have time traveling themes.

Same theme about sudden change in the age of the mane character...

Choi Si Won as main role again. Although he is arguably completely different in this drama (as he is even speaking a different language), he is just as amazing in this! I recommendand it completetly!

Show Lue is the male lead in both drama, no need further reason :)

In both dramas, there's a "older woman-younger man" relationship.

Both are moving drama specials based on true stories about people with two different handicaps. Both find their own way through life, Despite of their troubles and setbacks along the way. Two people Fighting to make others realise that they are just as capable as any other person out there.

A Romance takes place between a normal girl and a indieband rockstar, The two both makes a promise not to fall in love with the other. When the deadline passes by, Things will go back to the way they were... Or will they really? If you liked one, You'll surely like the other..

Both dramas are good comedy dramas spiced up with some ghosts mixed in. Both are definitely worth watching ~

Both are warm-hearted comedy dramas about a big family living under one roof. Both also have somewhat similar stories inside the episodes and the characters are also somewhat similar. Both are really good dramas. (Though I like 11nin mo Iru! a lot better)