"EVEN" vs "EVEN THOUGH"

• Even: used to show that something is surprising, unusual, unexpected, or extreme.

Examples

I don't even know where he is.

Everyone I know likes the smell of bacon - even Mike does and he's a vegetarian.

We were all on time - even Chris and he's usually late for everything. 

• Even though: although - connector showing contrast 

Examples

Even though he left school at 16, he still managed to become prime minister.

I like her even though she can be annoying at times.



Sources:
Cambridge Advanced Learner's Dictionary 3rd Edition
Oxford Advanced Learner's Dictionary 8th Edition