Wouldn't you feel anything if someone stole your belongings even if they needed money? Cause I definitely would. She should have ask like what my family always does instead of just taking away my money without permission. For Yun the scale is his treasure and gift from snow and my money is my savings. Stealing and asking are two different things.
Okay she may not deserve to be killed but the merman suffers because she stole the scale to for treatment.
This a spoiler
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Because she stole the scale and sold it for money the people were curious as to were does such a scale that worth a lot of money came from. People started hunting the merman and when Yun went to the lake men were taking Snow's scales and hurting him leaving the merman barely alive.
And seems like we have different perspective regarding personal belongings. In my stand point even if I were unconscious and needed money I still wouldn't want them to take away my things even if its for my own sake. Can't they just borrow some money first then ask after regaining consciousness? I would gladly give it up or find a way or another thing worthy of money. And owning a scale that can be considered rare of course they should have thought were he obtained it first as every actions have consequences
Welcome and thank you I also find fault in my reasoning. The girl didn't deserve that she died though I don't know how she was killed but yeah, she's a child its normal to be entice by beautiful objects its the adults who didn't think of the consequences and lecture her about stealing others personal things

I must be the reason she's dead when Su Yuan found her corpse. She deserves it. She may be a kid but doesn't she know about privacy and don't touch and take away anothers belonging?
If I were Yun I may not be able to kill her but I will hate her for life for she didn't just stole something precious but cause harm to someone important to me.