Lucifer's Descendant System - Chapter 289 - 289 She Knows

The schizophrenic and bullied middle schooler Lee Jin-woo is about to start high school, but just when he thought his biggest worry would be finding a way to avoid drawing attention to himself, a virus outbreak occurred on the second day, plunging his school into a nightmarish hell, a setting straight out of a zombie thriller movie.However, while he was trapped in this come-to-life zombie horror-flick, not only does he have to think of a way to survive, but he also has to grapple with the fact that this virus outbreak might have been caused by his careless mistake from earlier in the morning.....A rewrite of 'Apocalypse: Apparently, I Can See Zombies'#Story based in South Korea#Story based on South Korean zombie thrillers#Story best read at night#Story best read in bed#Story has plot twists#Story has irredeemable villains# Enjoy the story :)

Ruins stretched across the landscape in the apocalypse after the nuclear war.

Sergeant Xia Yao, born into a wealthy and renown ancestry, is a playboy who has turned over a new leaf. Yuan Zong is an ex soldier from the special forces who opened a bodyguard training company after being discharged.

When Yuan Ru, Yuan Zong’s sister fell for Xia Yao’s charms, but could not break down his erected barriers, she came to Yuan Zong for assistance. Little did she know, the moment Yuan Zong saw Xia Yao, this ex-special force knew no other person would ever catch his eye.

And so begins the battle between brother and sister for the most coveted price – Xia Yao’s heart.

- Description from Novelupdates

…but it seems pretty doable.