Suicide doesn't answer all problems. Yes, they have their issues, the world was cruel, capitalistic views on only looking at them as a monetary value, etc. But they are still breathing! They are alive! They have freedom of thought! They could run, or ask a favor from the writer, threatened their guardian! SO WHY BE DRAMATIC AND MAKING SUICIDE AS A SOLUTION, IT IS NOT.
There is no definite measurement of serotonin in your body, and even if i have more of it compared to you, that doesn't also mean I can only be more 'bubbly' because of it since it also involves memory and cognition. Biological mechanisms is only an effect of what you choose to feel therefore the neurotransmitters in your body doesn't decide your personality. It is what you make choose of it.
Good yuri art and for what?