Her father is.so proud of her and him trusting his daughter 
well
well
Spoiler!
After this Yeon took the Clear Qi oil/water and she found out that one drop of Clear Qi held so much power that it was difficult to control it but she somehow refined it and transferred to Jegal Hwamwu and after some days he woke up perfectly healthy and Yeon announced to the world that she used Divine pill received by grandpa and not Clear qi oil.
I like to post spoilers for the stories I find interesting because I don't have much time to read novel due to busy schedule
you will find me in most romantic historical manhwa comment sections 
you will find me in most romantic historical manhwa comment sections 