simply what i want:
(
when the red ball overlap the green rectangle on the bottom the red ball destroyed.
but when the green square overlap the green rectangle the green square moves up.
and thank you 
)
You can use things like Event Hit https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/UseOnHit/Blueprints/index.html to find out what you’ve hit or as an alternative; You can simply cast to whatever you’ve hit with the overlap and set some “Bools” to tell everyone who has hit what.