Does anybody know the title/song/music played during the weddings? I love it but don't know what its called.

This is the complete list of The Princess Wei Young OST. See if is one of them.

1. If Heaven Has Compassion (天若有情) – A-Lin
2. Heavenly Gift (天赋) – Tiffany Tang and Luo Jin
3. Next Life (來生) – Li Qi
4. Fate Because of Me (緣因我) – Jin Han
5. Growing Old Interdependently (白首相依) – Jin Chi and Sun Bolun
6. Illuminating Jade Treasury of Wisdom (玉燭寶典) – Cui Zige