preferably the student is a female, thx 

I personally love:
Thorn/Innocent Thing (lead: Jang Hyuk, Jo Bo Ah) 
Scarlet Innocence (lead: Jung Woo Sung, Lee Som) 
doctors (2016)
- park shinhye and kim raewon first meet when she's a student at the school he teaches

twenty again (2015)
- choi jiwoo plays the middle-aged student and lee sangyoon plays her ex-classmate now-teacher

you who came from the stars (2013)
- technically kim soohyun plays jun jihyun's college professor

drinking solo (2016)
- this one fits, i guess? gong myung plays the male student in love with his female teacher, park hasun

thx, unfortunately i watched all of those, anyways thanks tho :) 
i loved doctors... kim rae won is so hot XD 
try 100 days with mr. Arrogant. It has been long time since i watched it but i remember that at some point the main dude started tutoring the main girl. either way it is really fun movie :D
  • You Taught Me All the Precious Things (2011)
  • Close Range Love (2014) - this one's a movie tho
  • Hello Mr. Right (2016)
  • Sensei Ni Koishita Natsu (2016)
  • Secret Love Affair (2014)
hopefully these fit the criteria
i haven't yet seen most of these
thx everyone :D  
i watched most some of the suggestions already,  but pls feel free to suggest more since i usually stay up all night to just fin a whole drama, so ill probs run out of kdramas/kmovies soon. thx 
I Am Sam isn't great but it fills your requirements