Quick summary of 67

Here's the usual quick and dirty summary based on Google translate and lots of inference:
The chapter starts with the aunt asking Yoosun if she's seen the pendant before, and Yoosun says no. Yoosun asks if it's a cherished item, because the pendant looks too simple to belong to the aunt. She cryptically replies that sometimes simple things are more precious than any jewels...

Cut to Hyewon asking Yunwoo what was Dohwa's relationship with her mother, but Yunwoo says that's all that she can tell her.

And then it's flashback time. The aunt and Hyewon's mother (hereafter, HWM) are talking, and HWM tells the aunt about the antidote. She had looked for a month, and sent her dagger as a token.

Evil aunt then thinks, if the antidote is finished, my plans will be ruined, and asks if HWM has told Hyewon yet. HWM says no, in case the antidote doesn't work. The aunt then thinks "it's not too late!"

Cut to young Yunwoo and Dohwa - Yunwoo gives Dohwa a telescope to play with, and goes to speak to her parents.

They discuss the letter and dagger, and Yunwoo says they should move immediately. Dohwa's father asks for 3 more days, because there's a festival and he had promised to bring Dohwa there (SIGH).

Dohwa's mother says the sender of the letter has been trading(?) in medicines since a month ago, and that she thought she should do something to fulfil their request?. Yunwoo agrees, and asks that they give her the letter and dagger.

Cut to Dohwa enjoying herself at the festival with her parents, while Yunwoo watches them. Yunwoo then goes to check out the new safehouse. As they move, a veiled woman walks past them, and it's the aunt...

The scene changes to Yunwoo walking to Dohwa's home, wondering why they were late. As she approaches, there's a fire at one of the houses. She rushes there, and finds that all the guards and Dohwa's parents are dead :(

A cabinet door opens and Dohwa stumbles out - Yunwoo picks her up and thinks, "I must save this kid!"