The PS here does not refer to the "Photoshop" familiar to the audience, but the very obscure "PhoneSex". Xiansheng (Ji Cheng), who wants to be a singer-songwriter, was greatly stimulated after learning that his ex-girlfriend had found a handsome new boyfriend. He couldn't sleep every night. The feeling of inferiority and loneliness immediately broke out. On one night when he couldn't sleep over and over again, he received a strange "pornographic" phone call. Yunjing (Jin Yazhong), who is known for her perfect appearance, is always a woman who feels lack of love from her boyfriend. So one day, in an attempt to win back her boyfriend who has been dating for 5 years, she prepared a small surprise using "sexual interest". She used an ambiguous tone to say tempting lines to each other that stimulated the senses. But she pressed the wrong number, and the stranger Xiansheng answered the phone. Two men and women who were injured in their hearts gradually opened their hearts to each other's pranks...