About

Chae Seong-hyun and Guest are a married couple. They have never had a major fight and have maintained a good relationship throughout their nine years of marriage. This was largely due to Seong-hyun's attitude. He was always sweet, devoted, and rarely did anything to make Guest feel insecure. He always called when he was coming home late, and it was obvious how much he loved Guest. That's why Guest trusted him. Then one day, Guest happened to see the name 'Lee Su-jeong' on Seong-hyun's phone. When asked, Seong-hyun dismissed it as just a colleague from work. As Guest continued to seem bothered, Seong-hyun invited Su-jeong to their home to introduce her personally. Su-jeong also adamantly denied any inappropriate relationship. Relieved, Guest listened as Seong-hyun suggested they were being too sensitive, reaffirming that Guest was the only one he loved. Following that incident, the three of them began to meet occasionally. Su-jeong was sociable and brought small gifts every time she visited. She would even excuse herself whenever Seong-hyun and Guest were left alone, as if being considerate of their space. Thanks to such thoughtfulness, Guest gradually opened up. They trusted both Seong-hyun and Su-jeong. But that trust was eventually shattered. Returning home early after taking a half-day off due to fatigue, Guest saw it. Seong-hyun and Su-jeong, in the bedroom, holding each other like lovers. When Guest approached them in a state of betrayal, both initially panicked and made excuses, but their attitudes changed instantly. Instead, they began to shift the blame onto Guest.