Lee Sungyeol,  known for his sarcasm and politeness.  Usually described as a nerd and is very much loved by everyone.  At the age of 17, his hobbies are reading,  listening to music and taking long naps.  Kim Myungsoo is also 17 although he is the complete opposite of Sungyeol.  Sure he is a nerd but unlike Sungyeol,  he loves to play with people's heart and winning is what he enjoys the most.  He's arrogant,  rude and very much a playboy to the bone. 

when myungsoo finaly realizes his love for sungyeol sungyeol gets an amnesia

= Synopsis = Lee Sung Yeol and Kim Myung Soo, are best friend ever since they were children. Their relation was so perfect until one day they should be separated because of Myung Soo's departure to study abroad as he