A few days ago I posted a timeline theory (and purpose was to show connection between the destinies of Jang Uk and Jin By Yeon), but this is brief timeline (before watching Ep. 11)
20-21 years ago:
Jang Kang was a “genius mage”. For one year, he “did not come home.” (it’s not clear if he was away from home during that time or simply practicing spells)
He unsealed the ice stone. He practiced spells with Jin Mu in the Secret Room
After his failure with “Geom”, Jang Kang told Jin Mu he was stopping, but was ordered by King Go Seong to do a soul swap.
Do-Wha became pregnant (according to Do-joo, he stopped at this point).
Jang Uk was born “with the Kings Star”. A child born when that star appears will have “the energy of the Kings Star”. The Kings Star only reveals itself when the sky is filled w/the energy of the Daeho waters. It appeared on April 1st of year One of the King Go Soon regime.
Jin Bu-yeon was born. We do not know her birthdate or what her constellation plate might reflect.
Jang Kang sealed the ice stone, sealed Jang Uk’s energy gate and fled.
After watching Ep. 11, we need to re-examine the timeline - most of it was previously provided by Jin Mu talking to the Queen.
The BIG question now is: WHEN did Jang Kang unseal the ice stone? Was the 1st time when Ho-Gyeong asked for his help? She "heard" that the ice stone has the power to bring back the soul of the dead. - did she hand over the ice stone in order to save her baby? OR, was Jang Kang already practicing with the ice stone when she came to him. Regardless, we now know that Jin Bu-yeon's fate was "twisted" by the alchemy of souls - just as Jang Uk's fate was twisted.