I felt as if I had fallen seriously ill, unable to muster interest in anything, sleepless day and night, feeling like I couldn't do anything right.

I couldn't recall any of the lessons from just a few days ago.

Even so, I stared intently at my phone, hoping Dad would answer my call.

He was a renowned psychologist; surely he could help me.

But no matter how many times I dialed, all I heard was the same busy signal.

When Dad finally returned my call, his words made me feel like I had plunged into an ice pit:

"Stop calling me! Your sister is having a depressive episode. I'm very...