Master Lee tells the King he is a soul shifter
At the palace the King rants about Shaman Choi, then Master Lee reveals his soul is over a century old in a borrowed body; Mu-deok seeks the broker.

Every Alchemy of Souls moment featuring Master Lee Cheol, in story order. Played by Im Cheol-soo.
64 moments · 2h 28m · by Favseen
Moments 31–60 of 64
At the palace the King rants about Shaman Choi, then Master Lee reveals his soul is over a century old in a borrowed body; Mu-deok seeks the broker.
After a 100-day meditation, Master Lee steps out of his body to test Hwansu, finds villagers cremating it, and berates young Yeom from a boy's body.
Master Lee says soul shifters look like anyone else and only fear reveals them, then offers the King a gift: a dog.
Master Lee reveals he put Gwigu's spirit into a dead dog; its bark shows soul shifters are in the palace and the Queen demands it be taken away.
Master Lee says someone is making Soul Ejectors again, and that a power able to bring chaos means someone strong enough to stop it will appear.
Master Lee says the soul shifters showed themselves through fear; Uk, hurt in the fight, fusses over the dog while Yul wonders what Lee knows.
Over tea, a rumor about Naksu's new body leads to an argument over whether ordinary people are foolish or simply frightened.
Jinyowon's leader demands Gwigu back, accuses Master Lee of stealing it, and kills the dog that housed the relic to protect her daughter.
Asked why Gwigu attacked her, Cho-yeon admits she used a love charm; Gwigu is gone for good and her mother turns on her.
Songrim's elders fear Jin Mu will use Uk's birth against them, and pin their hopes on the wandering Jang Gang hearing the soul shifter rumours.
Expecting Jang Gang to surface, Master Lee gives Maidservant Kim a blank page for him and explains why Seo Gyeong's pupil stays away.
A man explains to two children that the King's Star brings great power and lonely responsibility, and says the star will soon appear.
Fishing with Master Lee, Uk admits the ice stone may be in him but refuses to awaken it, and asks for help if Mu-deok runs wild.
Mu-deok wakes freed of the bells as Jin Mu predicts her end, while a voice tells Uk, the King's Star, that this is not his end.
Jin Ho-gyeong is confronted over hiding Bu-yeon; a flashback shows the petrified body from the lake and an impossible choice between two souls.
Lady Jin learns the revived girl will grow Naksu's features and lose her powers and memory, and vows Jang Uk will never learn of her.
A patient demands to know what is inside his body; then Master Lee reappears after three years, saying he treated Jin Bu-yeon.
Master Lee reunites with Uk among the towers for slain soul shifters and learns Jin Bu-yeon tried to rebuild one; he reveals he once saved her.
Bu-yeon tells her mother she is regaining her powers and refuses to leave Uk; Lady Jin sees she is in love and demands Uk come apologize.
Master Lee suspects a charm is a copy of the volcano-born fire bird locked in Jinyowon and asks Uk to check on it; Uk refuses to get involved.
Told the royal family and Cheonbugwan are waking the fire bird and that the King's Star is his, Uk vows vengeance on a world he no longer cares for.
Master Lee hands Uk a gold plaque and letter: he is the late King's son, born through the alchemy of souls, and must not let his power bring chaos.
Lady Jin weighs how to cure a blood parasite, and it emerges that as Bu-yeon's divine powers return, Naksu's body may reject her.
Yul learns So-i died and the parasite is gone, and apologises to Bu-yeon about Danhyanggok as Master Lee arrives.
Yul asks if Master Lee knew who she was; Lee says two souls share the body and Jin Bu-yeon's will awaken and erase Naksu's.
Two allies agree Uk is better off not knowing: with Hwansu he could keep Naksu's soul, but only through forbidden sorcery.
Refusing to watch one hunt the other, Master Lee announces he will end their current relationship by being witness at their wedding.
After a mix-up over which way to face, Master Lee lists all four of her names; she picks her birth name, and he links light and shadow.
Over the wedding drink, echoes of their past promises play out before Master Lee declares them husband and wife.
Uk refuses to count the days left; she promises a sign when her final memory returns, and Master Lee thinks of Seo Gyeong's unsent letter.