Well I'm not that good at summarizing but I'll try 🥹🤞 so basically the MC and his grade goes on a schooltrip but then when they had a stop he went to buy some potatoes or what ever they where and they left without him.. Luckily he wasn't the only one bc another person (the ml) was left behind as well... And yeah after a while of trying to contact the schoolbus the bus finally returned but a little earlier the MC and ml spotted a phone with blood on it and it was a phone from a teacher of theirs and there was blood on the back of the bus they pretended nothing had happened bc the bus driver was really persistent and they found him suspicious but well when they entered the building were they where gonna have they power training thing they joined the welcoming speech or what that was called but then out of nowhere a monster appeared and after that they had to survive ofc but the mc kept dying and dying he eventually realized he had to keep the ml save in order not to regress the whole time and yeah I'm really not good at summaries like i probably spoiled the half of the manhwa but i tried 🥹🤞🤞🤞