Bugs in my house

Bugs suddenly appeared in my house 2 weeks ago.
When I first saw the bugs, I just thought they were some kind of mayflies.
Actually, I didn't want to think the bug is a cockroach, so I just threw them away after killing them.

Last week, I left my house because of lectures in Seoul.
When I came back home, I was surprised at the toilet bowl, because there were dead bugs in it.
How <a id="FALINK_5_0_4" class="FAtxtL" href="#">awful</a>........ There were almost six or seven bugs.
After I <a id="FALINK_6_0_5" class="FAtxtL" href="#">found</a> it, I started to clean the washroom.

I hate bugs, so I came back home as soon as possible yesterday.
I thought I need <a id="FALINK_1_0_0" class="FAtxtL" href="#">clean my</a> whole house.
I cleaned the refrigerator first, I threw away <a id="FALINK_4_0_3" class="FAtxtL" href="#">frozen food</a> and expired food.
I also cleaned all rooms by using a <a id="FALINK_2_0_1" class="FAtxtL" href="#">vacuum cleaner</a>.
When I finished cleaning, I felt a little bit more safe... but I was wrong.
Bugs appeared again.... How can I get rid of them? I really hate it. I don't want to go back home....

I hope you can get rid of the bugs! I hate bugs too!!