Dividing Line Parasite

There is a dividing line and a parasite in everyone's life. The so-called dividing line is a regret that is unforgettable in the palm of one's hand. The parasite is born for the former, and is created by some people to make up for their own psychological regrets. It is also a lonely and pitiful child. Each of them is entangled and confused in the emotions they are struggling to support. How will they settle their emotions? How to settle your heart?