Lian Sining takes a job playing someone's son.
Despite how poorly their identities seem to match, a paternity test gives him a 99.99% chance of being related.
The moment he steps into the Lin family home, he keeps repeating to himself, "I'm the real deal!"
Then Lin Xian, the eldest son raised from childhood to fit the mold of the Lin family's heir, sets his sights on him.
So he switches to a different mantra: "I'm a fake!"
P.S. If the names are hard to keep straight, silently read "Lian Po and Lin Xiangru" ten times!