Noona-romance for the win! (drama version)

Main couple age gap: around 5 years (I don't know how old is Su Ban Xia)  (27?/22)

Main couple age gap: 8 years (33/25)

Main couple age gap: around 10 years(?) (32/22)

Main couple age gap: 13 years (35/22)

Main couple age gap: 6 years (38/32)

Main couple age gap: around 4 years (28/24)

Main couple age gap: 16 years (34/18)

Main couple age gap: 15 years (35/20)

Main couple age gap: 12 years (30/18)

Main couple age gap: 10 years (35/25)

Main couple age gap: 7 years (25/18)

Main couple age gap: 7 years (31/24)

Main couple age gap: around 4 years (30/26?)

Main couple age gap: around 5 years (30?/25?)

Main couple age gap: 13 years (35/22)

Main couple age gap: 6 years (28/22)

Main couple age gap: 5 years (37/32)