Smile is the thing which can hide your pain,sorrow and everything. It not always come in happiness but some people used to take it as a mask also to hide their pain from others. While we are sad beside of answering someone what happened we can take the fake smile in our face for hiding it. As we don't know who feels what about listening our pain. Maximum people used to get happy by listening someone is in trouble that's why it's better to hide everything by just a single smile.
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