I LOVE happy endings too!
Korean Dramas:
1. Creating Destiny
2. Emergency Couple
3. Good Doctor
4. Introverted Boss
5. Lie To Me
6. Personal Taste
7. Queen In Hyun's Man
8. Shining Inheritance
9. Smile, You
10. That Fool
11. The Heirs
12. The Man Who Can't Get Married
13. The Master's Sun
14. The Time We Were Not In Love
15. Weightlifting Fairy
16. You Who Came From The Star
I'd suggest watching The Man Who Can't Get Married first, then Creating Destiny, then That Fool, then whatever else on my list.
Japanese Dramas:
1. Proposal Daisakusen
2. Soratobu Kouhoushitsu (2013)
3. Umi no Ue no Shinryoujo (2013)
4. Love Shuffle (2009)
I usually veer towards Korean and Chinese rather than Japanese dramas. Japanese make pretty good detective dramas, in my opinion. Their romantic comedies usually have open endings, which I don't really like.