Kyungsoo, who is the only son of three siblings of a single mother, has just come out to his sisters and mother and now he is struggling over new obstacle "Hopelessly falling in love with a stranger, a rich boy".

Without much experience in love, how will he overcome this extreme problem or will he give up without trying AGAIN?

Hi, my little journal book! 

My name is Do Kyungsoo. From now on, you will be my friend who I can share all my happiness and sadness with. 

Please take care of me.