My Chuseok is fantastic.   = My Chuseok was fantastic because my relatives gave me much money.

Because my relative gived me a many moneys. =  My relatives gave me much money.
And I watch the movie with my grandmother. =  I watched a movie with my grandmother.
I like Chuseok. = good sentence
Bcause in Chuseok I eat lots of food. = I like Chuseok  because in Chuseok I get to eat a lot of food like jeon and songpyeon. 
Like jeon, songpyeon.
bye~bye~!!