Is there other mangas/manhwas that have boys cross dressing? pls tell me

Big and beautiful

Try the
Men's Wear Store and "Her Royal Highness"

He looks so pretty crossdressing!!! (≧∀≦)

There are SO MANY (and the two above are great with the second being SO WONDERFUL), that your best bet would be to look at the Top Tags (near the comments) of Men's Wear Store and "Her Royal Highness" and simply click on the crossdressing one. It will give you a full list.