Cold lead male but then turn to sweet. Any recommended? No matter either japanese drama or taiwanese but not korean drama. Thank you :)

Marriage not dating
Arang and the Magistrate
Shining Inheritance
The Master's Sun

Edit: Just realized you didn't want a Korean drama. I second Hana Yori Dango then. :)
Taiwan:

It Started With a Kiss
Easy Fortune Happy Life
Fabulous Boys


The movie Clover (Japanese) fits your description
i think 90 percent dramas are like that. infact it is rare to find dramas with lead sweet from start
Miss Rose
Just You
Sweet Sweet Bodyguard
Tiamo Chocolate
Fall in Love With Me
Boku to Star no 99 Nichi
Yankee-kun to Megane-chan
Yamato Nadeshiko Shichi Henge
Switch Girl!!
Kurosagi




Please Love the Useless me