Modern screenwriter Lin Li time-travels into a dying ancient beggar, uses a tiger-shaped jade pendant to forge a crescent birthmark, and impersonates the Zhenguo General's younger son who has been missing for fifteen years. After entering the mansion, facing the layer-upon-layer testings of the suspicious steward, shrewd legitimate elder sister, and dignified legitimate mother, Lin Li gradually wins the trust and paternal love of General Lin Wei. Facing the fatal crisis of the fake birthmark gradually fading, he moves step by step, walking out a path of counterattack through the imperial examinations on the tightrope of true and false identities.