This song from “My Sassy Girl” by Shin Seung Hun is in G.
These are the “cheat” chords I played…
Part 1a: G - D/G - C/G - G - B/D#
Part 1b: Em7 - A7 - Cm - C/D
Part 2a: C - G/B - Am7 - C/D - G
Part 2b: Em - A - Am7 - C/D
Part 3a: G - Am7 - G/B - E4 - E/G# - Am - E+/G# - Am/G - D/F#
Part 3b: G - Am7 - G/B - B4 - B/D# - Em7 - Em7/D - A7/C#
Part 3c: C - G/B - Am7 - C/D
Part 4a: C - B - A/C# - B/D#
Part 4b: Em7 - Em/D - C - E/G#
Part 4c: Am - D/F# - B/D# - B - Em7 - Cm/Eb - C/D
hello. i just want to ask how do these Am7, Em7 etc are supposed to be played.I’m confuse on how to play it, can you help me?thank you. i’m looking forward. and by the way nice ‘cheats’!^^
Hi cristelle, thanks for your comments! The notes for Am7 are A-C-E-G, and for Em7 are E-G-B-D. I hope this answers your question.
you are simply amazing! is it possible if you could provide the whole music sheet for this song? would deeply appreciate it. Thanks and keep up the good job!
Hi maggie, thanks for your compliment!
I’m afraid I can’t provide any music sheet, since I don’t have any myself, and it will take a lot of time to come out with one. 
Cheers!
Thanks for the chord, it’s very useful ^^ , how to play E+/G# ? Thanks before ! ^^
Hi figa, sorry for the late reply! Glad to know you find the chords useful. E+/G# means playing the E+ chord with the right hand, and the G# note as bass with the left hand. The E+ chord is made up of E, G# and C notes. Hope this answers your question.