Hi @Taru_Chan- from a quick glance at your comic on Line Webtoon, it looks as though you currently have 26 readers. Do you perhaps feel as though your audience isn't growing fast enough? Is there a particular number you were expecting- and if so, how did you come up with it?
I can also see from the time stamps that you started posting the comic near the end of June. We're only just reaching the end of August now, so that's roughly three months and four episodes. Not very long at all in the grand scheme of things. I'm taking into account that your story doesn't seem like the type to draw readers in with instant gratification- not a whole lot of thrilling action or sexual tension. Your art style is pleasant to look at- but, and please don't take this the wrong way- it doesn't look as though you're aiming for a wildly impressive visual spectacle. It's expressive and gets the point across, so it's very good at what it needs to do- but it's not calculated to make the reader think "wow, that looks unbelievably beautiful!" I'm also guessing you don't have a massive prior audience that you're bringing over from past projects. So 26 doesn't seem like an unexpectedly low number of readers at this stage- because what you're creating is a slow burn narrative comic. Possibly your first?
Perhaps you need to reconsider your goals? Did you begin this journey with popularity as your first priority- or is it about telling the story you want to tell? Of course we all want to be able to support ourselves with our creative endeavors. But if you want to do that with something you're passionate about, it may be worth recognizing that is a very long, slow and often frustrating game. It's possible that you are already doing everything right.
I haven't been at this very long myself, but I can give some practical advice that somebody else with more experience is welcome to overrule:
-You may want to consider choosing an update time and sticking to it, so readers know what to expect. Instead of varying the day of the week, try posting at different times of the same day each week (i.e. mornings vs. evenings- and see how that goes). Most importantly, try to stick with something you know you can maintain.
-You may want to try joining a few webcomic creator communities where you and your peers can help each other stay motivated, exchange feedback, and possibly cross-promote down the line. Just make sure your interest in other people's work is genuine, and you're not doing this purely out of a desire to grow your audience.
-Try webcomic groups on Twitter. They often have recurring discussion events where you can answer questions alongside fellow creators in a public setting. You may find yourself meeting peers that way with similar ideas to your own- and vice versa. Other people will take an interest in you too.
-Communicate with people on forums like this one. Be polite and personable, and as helpful as you can when somebody asks a question you feel you may have an answer to- or alternatively, when someone brings up a topic you happen to be invested in, show your interest.
Perhaps most importantly- when you feel discouraged, try to remember why you're doing this. What drew you to it in the first place? Personally, I have themed music playlists and a bookcase full of stories that always remind me of the why when I feel like I've lost track.
And good luck 
