| 1 | COVID-test | ‘test’, ‘confirmed cases’, ‘sequester’, ‘self’, ‘contact’, ‘public health center’, ‘visit’, ‘result’, ‘negative’, ‘call' |
| 2 | Economy | ‘loans’, ‘contract’, ‘personal’, ‘progress’, ‘bank’, ‘situation’, ‘operation’, ‘monthly rent’, ‘card' |
| 3 | School | ‘school’, ‘academy’, ‘student’, ‘class’, ‘start of school’, ‘online’, ‘postponement’, ‘teacher’, ‘attending school’, ‘lecture' |
| 4 | Hospital/Diagnose | ‘hospital’, ‘pain’, ‘treatment’, ‘left’, ‘right’, ‘prescription’, ‘leg’, ‘doctor’, ‘clinic’, ‘surgery' |
| 5 | Travel/Oversea | ‘travel’, ‘situation’, ‘cancel’, ‘entry’, ‘oversea’, ‘refund’, ‘schedule’, ‘reservation’, ‘visa’, ‘period' |
| 6 | Life/Health | ‘exercise’, ‘method’, ‘start’, ‘day’, ‘life’, ‘support’, ‘health’, ‘diet’, ‘dog’, ‘health' |
| 7 | Social issue | ‘reason’, ‘thinking’, ‘government’, ‘Korea’, ‘church’, ‘nation’, ‘situation’, ‘country’, ‘economy’, ‘a new world' |
| 8 | Symptom 1 (respiratory) | ‘cough’, ‘symptom’, ‘runny nose’, ‘cold’, ‘sputum’, ‘fever’, ‘sneezing’, ‘rhinitis’, ‘dry cough’, ‘tickling' |
| 9 | Relationship | ‘friend’, ‘contact’, ‘idea’, ‘story’, ‘female’, ‘male’, ‘heart’, ‘worry’, ‘game’, ‘present' |
| 10 | Symptom 2 (headache, fever) | ‘head’, ‘symptom’, ‘headache’, ‘muscle pain’, ‘slight fever’, ‘body temperature’, ‘body ache’, ‘normal’, ‘suspicion’, ‘vomiting' |
| 11 | Workplace | ‘company’, ‘salary’, ‘work’, ‘unemployment’, ‘monthly salary’, ‘staff’, ‘resignation’, ‘job’, ‘commute’, ‘period' |
| 12 | Mask/social distance | ‘mask’, ‘stage’, ‘distance’, ‘food’, ‘cafe’, ‘bus’, ‘song’, ‘wearing’, ‘disinfection’, ‘utilization' |
| 13 | Infection/Vaccine | ‘person’, ‘infection’, ‘likelihood’, ‘pneumonia’, ‘dangerous’, ‘vaccine’, ‘Wuhan’, ‘probability’, ‘worry’, ‘Chinese' |
| 14 | Stimulus package | ‘application’, ‘subsidy' ‘support’, ‘document’, ‘report’, ‘income’, ‘confirm’, ‘disaster’, ‘emergency’, ‘standard' |
| 15 | Family | ‘mother’, ‘thinking’, ‘father’, ‘parents’, ‘family’, ‘brother’, ‘stress’, ‘heart’, ‘grandmother’, ‘person' |
| 16 | Delivery service | ‘use’, ‘parcel service’, ‘delivery’, ‘purchase’, ‘call’, ‘internet’, ‘arrival’, ‘price’, ‘number’, ‘thing' |
| 17 | Unclassified | ‘problem’, ‘photo’, ‘partly’, ‘face’, ‘skin’, ‘situation’, ‘first’, ‘start’, ‘washroom’, ‘total' |
| 18 | Region | ‘region’, ‘Daegu’, ‘Busan’, ‘Gyeonggi’, ‘week’, ‘schedule’, ‘near’, ‘vacation’, ‘this year’, ‘Seoul' |
| 19 | Study/Exam | ‘study’, ‘examination’, ‘ready’, ‘school year’, ‘English’, ‘university’, ‘math’, ‘term’, ‘high school’, ‘middle term' |
| 20 | Worry/Anxiety | ‘worry’, ‘anxiety’, ‘stuffy’, ‘chest’, ‘symptom’, ‘usual’, ‘situation’, ‘uncomfortable’, ‘day’, ‘menstruation' |