In both:
• The ML is rich and FL is poor
• The ML and FL first hated each other
• The FL is really fierce is bit of a thug
• The ML has a first love who left him, and then returns just as the love between ML and FL is blossoming

Differences:
• In MDDNKM, the FL stays in the house of ML while in HIH, both the groups become friends.
• While there is a lot of live triangles in MDDNKM, in HIH, there are more than one pair of lovers.

There are 2 seasons in MDDNKM, while the second season of HIH is yet to come out.
If you liked MDDNKM, then you will definitely love HIH. They have similar story lines, except that the setting is different.

Bon spectacle!