Great-Grandma from 1945 — Episode 4

Zofia Linton (codename 'Duckweed'), a revolutionary soldier who died in 1945, is reborn in 2025 as a high school student. She discovers Nathan Graham, the baby she saved, has become the richest man in Nanling City, while her fiancé, Arthur Sterling, is still alive. Facing her adoptive family's schemes and school bullying, Zofia uses her underground agent skills to reveal historical truths, correct the pro-Western thinking of the younger generation, and drive breakthroughs in the nation's quantum cryptography. She eventually reunites with the centenarian Arthur Sterling to safeguard their faith in their country.