Merge pull request #40 from KimMinJeong/lsg_branch

Lsg branch
day1020 - merge
day1020 modify conflict
Merge pull request #41 from KimMinJeong/ksk_branch

Ksk branch
modify chatting size, modify ip address, modify meta
Merge pull request #42 from KimMinJeong/kmj_branch

modify chatting size, modify ip address, modify meta
merge