Unstoppable Marriage (2007)

Madama Shim has four sons. Their names are Ki Baek, Lee Baek, Sam Baek, and Sa Baek. Madam Shim's eldest son, Ki Baek, falls in love with Goo Mi Ho, the daughter of her enemy, Goo Gook. Wang Sam Baek is the third son of Madam Shim. He becomes friends with Chae Soo Jung. His older brother Lee Baek falls in love with Soo Jung, a beautiful twenty-three-year-old hotel management student who studies at his mother's hotel. Things get complicated as Sam Baek finds himself falling for Soo Jung as well. Soo Young and Yu Ri both like the fourth son of Madam Shim, Sa Baek. But Sa Baek doesn't return their feelings and tries to ignore them at all costs.