Chapter 20 (2.14) Mother angrily beats son, sister sympathizes with brother

What is the definition of childhood sweethearts? Is it a heterosexual couple who have grown up together since childhood?

If we calculate it that way, then she and her brother were childhood sweethearts.

But after a mother and daughter who depended on each other moved in across the hall, she realized the most important prerequisite for childhood sweethearts—

They are actually not related by blood.

What kind of childhood sweethearts are siblings? They’re just a man and a woman born from the same mother’s womb, destined to be bound by ethics.

However, back then she was just a little girl…