Sung Yuri revealed that she wrote letters to her ex-boyfriend everyday for 4 years after breaking up with him. She recently guested on KBS's "Happy Together Season 3" and said, "Even after having broken up with my boyfriend, I still had feelings for him so I wrote letters to him for a long time. One day, I thought I must stop so I sent him a text saying I wanted to give him the letters." Even after reading the text, her ex-boyfriend's responded coldly, "Throw them away or burn them, do whatever you want." The former Fin.K.L member said, "Lee Jin was with me at the time and she got really mad after reading the text. She told me to bring her the letters and cooking oil right away." She elaborated on her story, "We went to Han River and began burning the letters but they didn't burn well like you see in movies. It was very windy and the fire wasn't even big. We were even caught by the police who were passing by. They told us to clean everything up." Source: Seoul NTN via Nate