2 152 1 means "I love you", which is Li Lei's confession to Han Meimei at the beginning, and also the code word of radio communication. Han Meimei searched for it for ten years, but he didn't find it. Later, he came across the eggs behind the subtitles and contacted Li Lei with an old-fashioned radio.

Li Lei has always liked learning "radio". When he left, he sent Han Meimei a radio with the words "2 152 1" written in a special pen, which was Li Lei's confession to Han Meimei.

The last picture of the film shows that there is a radio on Li Lei's desk in an American university. In fact, this radio was given to Han Meimei at that time, which was equivalent to two walkie-talkies. The frequency band was "2 152 1", so Han Meimei, who knew the answer, choked and said, My name is Han Meimei. What's your name? . "I didn't expect to crack the password of 10.

Extended information Li Lei and Han Meimei:

Han Meimei (Zifeng Zhang), a middle school girl with all-around sports, gets good grades, but when it comes to English, she has a terrible headache. After ending their happy junior high school life, Wei Hua () and Lin Tao () and Li Lei () went to high school together.

Today, Li Lei is thoroughly remoulded, from an obscure little boy to a tall and handsome male god, and speaks perfect English. Han Meimei also unconsciously fell in love with Li Lei, but she was too slow to speak, so she made various battle plans to seize Li Lei.