The two young classmates of the story, who cheat their classmates of their allowances and are a source of constant headaches for their teacher, rebel against their world by yelling, screaming, chasing others, and fighting. But when as a grown-up Liar No. 2 is reunited with a cartoon character key ring he valued in his youth, audiences can't help but be flooded with feelings of warmth.
就像《囧男孩》中，兩位騙同學零用錢、令老師頭痛不已的小男孩，不斷用叫喊、嘶吼、追趕、打鬧來對抗周遭世界，然而當長大後的騙子二號與老舊的卡達天王鑰匙圈重逢，觀眾心中竟湧出一股暖流。