The House of Lee Baek-moon, a senior playwright in Busan. Today is the birthday of Lee Baek-moon's wife, Park Ji-yeon. Even though it is his wife's birthday, Lee Baek-moon is drinking with his friend Kim Jin-hae. Their daughter Lee Chae-rin enters her room without saying much just as usual. Their son Lee Woo-suk comes home after a long time with his mother's birthday cake and his entire salary as pocket money for the family. Everyone welcomes him. However, Lee Woo-seok gets upset that his father is drinking with his friend even on his mother's birthday and vent his anger on his younger sister Lee Chae-rin, the easy target, and this leads to a family quarrel.