In Under the Moonlight episode 21, female bailiff Luo Su clears Xue Wenyi of false adultery charges by investigating the murder of stable groom Wu Dali. Luo Su uncovers illicit pills from a rogue cult, revealing that concubine Xiao Yue killed her blackmailer after being pushed into an extortion scheme.
| Item | Details |
|---|---|
| Drama Title | Under the Moonlight (Feng Yue Jin Nang) |
| Episode Number | Episode 21 |
| Key Characters | Luo Su, Qi Menglin, Xue Wenyi, Zhou Xuan, Xiao Yue, Wu Dali, Liu Wan |
| Core Incident | Adultery frame-up of Xue Wenyi and staged suicide of groom Wu Dali |
| Perpetrator | Concubine Xiao Yue (poisoning and staged hanging) |
The Inner Manor Scandal: Underwear, Suspicion, and Family Honor
The tension inside the Zhou household explodes after Qi Menglin scales the courtyard wall searching for Luo Su. Mistaken for an intruder, his sudden presence sparks outrage from Zhou Xuan, an ambitious scholar who instantly suspects his wife, Xue Wenyi, of improper conduct. Cousin Liu Wan quickly steps in to defuse the initial confrontation, but peace vanishes within hours.
"You owe me a clear explanation." — Zhou Xuan
Men's underwear turns up concealed beneath Xue Wenyi's mattress. Terrified of a public scandal that could derail his bureaucratic promotion, Zhou Xuan demands immediate answers. Xue Wenyi has spent two childless years watching her standing erode, while concubine Xiao Yue—once Zhou Xuan's betrothed—holds immense leverage after giving birth to the family's sole son.
"I will uncover the truth behind this case." — Luo Su
Facing total disgrace and expulsion, Xue Wenyi finds an ally in Liu Wan, who begs Luo Su to step in. Luo Su accepts the case and settles into the Zhou residence to observe the dynamic firsthand.
"Xiao Yue gave birth to the only son of the Zhou clan." — Xue Wenyi
If you want a closer look at the attire worn during these tense confrontations, check out the Under the Moonlight Episode 21 Outfits: Luo Su's High Collar and Hairpin Style Guide and our previous wardrobe review in the Under the Moonlight Episode 20 Outfits: Luo Su's Bailiff Robe and Noble Hairpin Style Guide.
The Staged Stable Hanging: How Luo Su Debunked the Suicide Claim
Luo Su narrows her suspicions down to Wu Dali, a distant relative of Xiao Yue who works as the estate's groom. Just as she confirms his alibi is fabricated, Wu Dali is discovered hanging dead from a beam inside the horse stables.
"Treat this as if the groom hanged himself in suicide." — Zhou Xuan
Zhou Xuan wants the incident buried immediately without alerting the county yamen. He prioritizes his civil examination prospects over an investigation, ordering servants to remove the body quietly. Luo Su stops the cover-up by conducting an on-the-spot examination of the corpse.
"These look like marks left from someone dragging the body after death." — Luo Su
The physical evidence refutes suicide. The angle of the slipped footwear and visible abrasions across the victim's heels prove Wu Dali died before being moved. Someone poisoned or strangled him first, dragged his limp body across the ground, and strung him up to fabricate a self-inflicted hanging.
"As a woman myself, I want to help my cousin sister." — Luo Su
Recognizing this as a silencing murder, Luo Su resolves to uncover the mastermind before another innocent person takes the fall.
Blackmail, Poisons, and the Dark Past of the Xiangtang Shrine
Using an exorcism ritual as cover to bring in a county coroner, Luo Su searches Wu Dali's servant quarters. Underneath mundane belongings lies a stash of silver coins far exceeding a groom's wages, alongside two distinct medicinal formulas: black Qiying Dan and golden Tiaojing Zhongzi Wan.
"The black pills are Qiying Dan, and the gold ones are Tiaojing Zhongzi Wan." — Luo Su
These medicines tie directly to Xiangtang, a criminal cult dismantled by authorities for drugging and assaulting women seeking fertility blessings. Servant logs indicate Wu Dali arrived at the Zhou estate shortly after the cult's collapse. He was a fugitive member using insider leverage.
"Xiao Yue was one of the victimized women from Xiangtang." — Luo Su
Xiao Yue had visited Xiangtang in secret years earlier before conceiving her son, where Wu Dali assaulted her. When Xiangtang fell, Wu Dali tracked her down and blackmailed her under threat of exposure. In exchange for silence, he demanded money and agreed to plant the clothing under Xue Wenyi's bed.
"Unable to endure endless extortion, she killed him." — Luo Su
When Wu Dali's greed only grew, Xiao Yue poisoned him and staged his hanging to escape his grip permanently.
Moral Ambiguity: Desperation Versus Calculated Ambition
Episode 21 presents viewers with two contrasting portraits of guilt. On one side stands Xiao Yue: a woman who survived a predatory cult only to find herself trapped by an unrepentant blackmailer. Her choice to frame Xue Wenyi and poison Wu Dali shows how desperation can turn a victim into a ruthless schemer.
On the other side stands Zhou Xuan, whose guilt is moral rather than physical. His immediate impulse when facing a potential murder was to bury the corpse and silence his wife to preserve his official record. Viewers can debate which character proves more chilling: the woman who struck back with fatal poison to hide past trauma, or the official willing to sacrifice innocent lives for a bureaucratic appointment.
For the aftermath of this investigation and how county magistrate Han Wuji handles the estate, read our breakdown in the Under the Moonlight Episode 22 Recap: The Staged Stable Hanging and Xue Wenyi's Truth.
Frequently asked questions
Why was Xue Wenyi accused of adultery in the Zhou manor?
Concubine Xiao Yue arranged for stable groom Wu Dali to hide men's undergarments beneath Xue Wenyi's mattress. Xiao Yue wanted Xue Wenyi banished to consolidate power as the mother of Zhou Xuan's only son.
How did Luo Su discover that Wu Dali's death was not a suicide?
Luo Su examined Wu Dali's body and found heel abrasions indicating his corpse was dragged across the ground after death. The position of his dislodged shoes also contradicted the physical mechanics of a genuine hanging.
What was Wu Dali's connection to the Xiangtang shrine?
Wu Dali was an escaped member of the Xiangtang cult. He had previously assaulted Xiao Yue at the shrine and subsequently tracked her to the Zhou estate, using her past trauma to extort money.
Why did Xiao Yue murder Wu Dali?
Wu Dali continued to demand larger sums of money even after planting false evidence against Xue Wenyi. Facing never-ending blackmail and exposure, Xiao Yue poisoned him and staged the scene as a hanging.