Songrim fears someone has unsealed the ice stone
At Songrim, the talk turns to Gwigu's origins and to the only way souls can be shifted without Hwansu: the ice stone is back in the world.

Every Alchemy of Souls moment featuring Park Jin, in story order. Played by Yu Jun-sang.
114 moments · 4h 21m · by Favseen
Moments 31–60 of 114
At Songrim, the talk turns to Gwigu's origins and to the only way souls can be shifted without Hwansu: the ice stone is back in the world.
Maid Kim asks if he would lock her in like Jinyowon's leader; he will not lie to her, and only admits too late how it would break his heart.
At Cheonbugwan, Songrim's leader hears that Naksu's father was a soul shifter and is shown the hidden star plate from the night Jang Uk was born.
Park Jin asks about Jang Gang's secret spell training before Uk's birth, and the talk turns to a shocking claim about whose son Uk is.
Songrim mages spin the Tansu killing into a legend of an invincible Naksu in blue cloth who is coming for them next.
Shaken by fears for Uk, Maid Kim plays at being someone else; Park Jin offers his back, admits he never wants to hurt her, and asks her to keep it up.
Asked to keep Uk away from the formal duel, Songrim's leader says he will only watch, whether Uk runs or dies.
Uk receives the uniform, Spirit Plaque and Book of Regulations, bows to the leader and his peers, and the mages head off to party on the Jang family's tab.
Two old friends reminisce about Uk as a newborn, then squabble over a raisin tree pill and whether one of them is going gray.
Uk and Mu-deok split Master Heo's pill, and Park Jin keeps trying to hand his to Maid Kim as she walks away.
Drunk Master Heo reveals he brought Do-hwa to Sejukwon to match her with Park Jin, who never said the words; his shrug at lost love sends Maid Kim off.
Hungover Uk asks for Mu-deok and gets the maid from the inn, learns who Yun-ok is, and Maid Kim says she reminds her of Madam Do-hwa.
Park Jin's logic sets off a spat with Maid Kim that everyone can read, and Dang-gu gets scolded for trying to follow Uk and Yun-ok.
The leader refuses an exception and probes whether Uk needs his maid to reach a secret master; to protect her, Uk gives in.
Uk recites Songrim's rules from memory to win his freedom, but the leader says he only memorized them and sets a new condition.
The leader reveals he is keeping Uk close only to stop trouble, expecting Jang Gang to come once he hears his son entered Songrim.
Park Jin scolds Maid Kim for gifting a scarf to get Mu-deok into Songrim; wounded pride turns it into a falling-out neither wanted.
Told Uk read the book and carried his collapsed maid to Sejukwon, Park Jin realizes Mu-deok has always been at Uk's side.
Master Lee visits Maid Kim with flowers; Park Jin shows up worried and empty-handed, and she tells him she wants flowers, not weeds.
Park Jin scolds his nephew for courting Jinyowon's heir; Dang-gu wishes for a sibling to inherit instead and gets chased out.
Park Jin wants Master Kang's body examined for sorcery before cremation; Jin Mu objects and Lady Jin sides with him.
Two masters piece together that Naksu, Cho Chung's daughter, unknowingly disposed of Jin Mu's discarded soul-shifter bodies.
At the cremation Park Jin has Yul pour energy into the body; it turns out to be a soul shifter, and Songrim claims the case.
Park Jin confronts Jin Mu over the cover-up, then the rampaging soul shifter fights until Cheonbugwan strikes it down.
Jin Mu reminisces with Maid Kim about serving Jang Gang and asks to share biscuits with Uk; Park Jin refuses and sends him away.
Park Jin sends every trained mage to Sejukwon except Uk, telling him he is excluded and may go home.
Park Jin offers a flimsy reason for Uk's visit, Uk accuses Jin Mu of hiding a soul shifter, and the Crown Prince orders a check on the eunuch.
Park Jin apologizes and offers to fix the basin; when Jin Mu insists on punishing Uk himself, Mu-deok's wailing plea gets him released to Songrim.
Mu-deok explains why she made a scene; Park Jin says he knows they told the truth and suspects Jin Mu holds the ice stone.
Songrim's leader asks for Jinyowon's relics to unmask soul shifters; Lady Jin refuses and he accuses her of a deal with Jin Mu.