[TOMT] – Asian drama/coming of age – young boy pranks another by crying wolf that there is a herd chasing after him

This one is gonna stump a few people. It’s a 2000s asian film. Possibly chinese or south Korean. There is a general story arc of this young boy (#1) becoming a better person but he does a horrible thing near the beginning.
The setup is they are in the countryside and a young girl is loudly yelling at a young boy (#2) across the other side of a valley: “Run!”, as there is a herd of cattle or bulls chasing him up a hill. The boy manages to escape whilst the girl and another boy (#1) look on from across, the girl is impressed whilst the boy #1 seems jealous.
Later on, boy #1 sees boy #2 going up the same hillside and thinks it would be funny to prank him and yells at him to run, boy #2 doesn’t look behind him and believes he is being chased when nothing is there. This time boy #2 falls over and thinks he’s about to be trampled, only to realise he was tricked and boy #1 laughs at him.
After that, boy #1 this time is walking up the hillside and it’s boy #2 who is on the other side of the valley yelling for him to run. Boy #1 doesn’t believe him and thinks he’s trying to get revenge, except it turns out there was a herd running up the hill and he finally suffers for his actions.
Can’t remember what happened after, whether boy #2 runs over and saves him or something else to that affect.
Hopefully this is enough to go by.